message: Upgrade to Xcode 12.5.1
  This changelist upgrades GitHub Actions builds to Xcode 12.5.1, as Xcode 12.5 has been removed from the MacOS 11 virtual environment.
diff: @@ -66,7 +66,7 @@ jobs:
  - name: MacOS_Xcode_12_Python37
  os: macos-11
  compiler: xcode
  - compiler_version: "12.5"
  + compiler_version: "12.5.1"
  python: 3.7
  - name: MacOS_Xcode_13_Python38
  