message: ci: Bump macOS image to big-sur-xcode-12.5
  This also removes the "brew update" added in commit
diff: @@ -197,12 +197,11 @@ task:
  task:
  name: 'macOS 11 native [gui] [no depends]'
  brew_install_script:
  - - brew update
  - brew install boost libevent berkeley-db4 qt@5 miniupnpc libnatpmp ccache zeromq qrencode sqlite libtool automake pkg-config gnu-getopt
  << : *GLOBAL_TASK_TEMPLATE
  osx_instance:
  # Use latest image, but hardcode version to avoid silent upgrades (and breaks)
  - image: big-sur-xcode-12.4 # https://cirrus-ci.org/guide/macOS
  + image: big-sur-xcode-12.5 # https://cirrus-ci.org/guide/macOS
  env:
  << : *CIRRUS_EPHEMERAL_WORKER_TEMPLATE_ENV
  CI_USE_APT_INSTALL: "no"
  