prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Backend loading code produces a warning with the latest setuptools
  The use `load(require=False)` (specifically the `require` kwarg) is deprecated. /cc @dstufft 
  
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `src/cryptography/hazmat/backends/__init__.py`
  Content:
  ```
  1 # This file is dual licensed under the terms of the Apache License, Version
  2 # 2.0, and the BSD License. See the LICENSE file in the root of this repository
  3 # for complete details.
  4 
  5 from __future__ import absolute_import, division, print_function
  6 
  7 import pkg_resources
  8 
  9 from cryptography.hazmat.backends.multibackend import MultiBackend
  10 
  11 
  12 _available_backends_list = None
  13 
  14 
  15 def _available_backends():
  16     global _available_backends_list
  17 
  18     if _available_backends_list is None:
  19         _available_backends_list = [
  20             backend.load(require=False)
  21             for backend in pkg_resources.iter_entry_points(
  22                 "cryptography.backends"
  23             )
  24         ]
  25 
  26     return _available_backends_list
  27 
  28 _default_backend = None
  29 
  30 
  31 def default_backend():
  32     global _default_backend
  33 
  34     if _default_backend is None:
  35         _default_backend = MultiBackend(_available_backends())
  36 
  37     return _default_backend
  38
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/src/cryptography/hazmat/backends/__init__.py b/src/cryptography/hazmat/backends/__init__.py
  --- a/src/cryptography/hazmat/backends/__init__.py
  +++ b/src/cryptography/hazmat/backends/__init__.py
  @@ -17,8 +17,13 @@
   
       if _available_backends_list is None:
           _available_backends_list = [
  -            backend.load(require=False)
  -            for backend in pkg_resources.iter_entry_points(
  +            # setuptools 11.3 deprecated support for the require parameter to
  +            # load(), and introduced the new resolve() method instead.
  +            # This can be removed if/when we can assume setuptools>=11.3. At
  +            # some point we may wish to add a warning, to push people along,
  +            # but at present this would result in too many warnings.
  +            ep.resolve() if hasattr(ep, "resolve") else ep.load(require=False)
  +            for ep in pkg_resources.iter_entry_points(
                   "cryptography.backends"
               )
           ]
  
verification_info: {"golden_diff": "diff --git a/src/cryptography/hazmat/backends/__init__.py b/src/cryptography/hazmat/backends/__init__.py\n--- a/src/cryptography/hazmat/backends/__init__.py\n+++ b/src/cryptography/hazmat/backends/__init__.py\n@@ -17,8 +17,13 @@\n \n     if _available_backends_list is None:\n         _available_backends_list = [\n-            backend.load(require=False)\n-            for backend in pkg_resources.iter_entry_points(\n+            # setuptools 11.3 deprecated support for the require parameter to\n+            # load(), and introduced the new resolve() method instead.\n+            # This can be removed if/when we can assume setuptools>=11.3. At\n+            # some point we may wish to add a warning, to push people along,\n+            # but at present this would result in too many warnings.\n+            ep.resolve() if hasattr(ep, \"resolve\") else ep.load(require=False)\n+            for ep in pkg_resources.iter_entry_points(\n                 \"cryptography.backends\"\n             )\n         ]\n", "issue": "Backend loading code produces a warning with the latest setuptools\nThe use `load(require=False)` (specifically the `require` kwarg) is deprecated. /cc @dstufft \n\n", "before_files": [{"content": "# This file is dual licensed under the terms of the Apache License, Version\n# 2.0, and the BSD License. See the LICENSE file in the root of this repository\n# for complete details.\n\nfrom __future__ import absolute_import, division, print_function\n\nimport pkg_resources\n\nfrom cryptography.hazmat.backends.multibackend import MultiBackend\n\n\n_available_backends_list = None\n\n\ndef _available_backends():\n    global _available_backends_list\n\n    if _available_backends_list is None:\n        _available_backends_list = [\n            backend.load(require=False)\n            for backend in pkg_resources.iter_entry_points(\n                \"cryptography.backends\"\n            )\n        ]\n\n    return _available_backends_list\n\n_default_backend = None\n\n\ndef default_backend():\n    global _default_backend\n\n    if _default_backend is None:\n        _default_backend = MultiBackend(_available_backends())\n\n    return _default_backend\n", "path": "src/cryptography/hazmat/backends/__init__.py"}], "after_files": [{"content": "# This file is dual licensed under the terms of the Apache License, Version\n# 2.0, and the BSD License. See the LICENSE file in the root of this repository\n# for complete details.\n\nfrom __future__ import absolute_import, division, print_function\n\nimport pkg_resources\n\nfrom cryptography.hazmat.backends.multibackend import MultiBackend\n\n\n_available_backends_list = None\n\n\ndef _available_backends():\n    global _available_backends_list\n\n    if _available_backends_list is None:\n        _available_backends_list = [\n            # setuptools 11.3 deprecated support for the require parameter to\n            # load(), and introduced the new resolve() method instead.\n            # This can be removed if/when we can assume setuptools>=11.3. At\n            # some point we may wish to add a warning, to push people along,\n            # but at present this would result in too many warnings.\n            ep.resolve() if hasattr(ep, \"resolve\") else ep.load(require=False)\n            for ep in pkg_resources.iter_entry_points(\n                \"cryptography.backends\"\n            )\n        ]\n\n    return _available_backends_list\n\n_default_backend = None\n\n\ndef default_backend():\n    global _default_backend\n\n    if _default_backend is None:\n        _default_backend = MultiBackend(_available_backends())\n\n    return _default_backend\n", "path": "src/cryptography/hazmat/backends/__init__.py"}]}