message: Update LMDB to 0.9.29
  The exiting LMDB used in tensorflow is from 0.9.22(03/22/2018) which
  is alreay 3 years old. For that it makes sense to update LMDB to
  the latest version of 0.9.29 (released a month ago).
diff: @@ -682,12 +682,12 @@ def _tf_repositories():
  tf_http_archive(
  name = "lmdb",
  build_file = "//third_party:lmdb.BUILD",
  - sha256 = "f3927859882eb608868c8c31586bb7eb84562a40a6bf5cc3e13b6b564641ea28",
  - strip_prefix = "lmdb-LMDB_0.9.22/libraries/liblmdb",
  + sha256 = "22054926b426c66d8f2bc22071365df6e35f3aacf19ad943bc6167d4cae3bebb",
  + strip_prefix = "lmdb-LMDB_0.9.29/libraries/liblmdb",
  system_build_file = "//third_party/systemlibs:lmdb.BUILD",
  urls = [
  - "https://storage.googleapis.com/mirror.tensorflow.org/github.com/LMDB/lmdb/archive/LMDB_0.9.22.tar.gz",
  - "https://github.com/LMDB/lmdb/archive/LMDB_0.9.22.tar.gz",
  + "https://storage.googleapis.com/mirror.tensorflow.org/github.com/LMDB/lmdb/archive/LMDB_0.9.29.tar.gz",
  + "https://github.com/LMDB/lmdb/archive/refs/tags/LMDB_0.9.29.tar.gz",
  ],
  )
  