message: pin xcode on bazelci hosted machines
diff: @@ -19,6 +19,7 @@ tasks:
  - "..."
  macos:
  name: "PlaidML MacOS"
  + xcode_version: "11.2"
  shell_commands:
  - curl -O https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh
  - sh ./Miniconda3-latest-MacOSX-x86_64.sh -b -p $HOME/miniconda
  