message: Switch to 5.12.12 release
  Previous build failure looks like it's just a temporary
diff: @@ -8,7 +8,7 @@ on: [push, pull_request, workflow_dispatch]
  env:
  BUILD_TYPE: Release
  - QT_VERSION: 5.12.10
  + QT_VERSION: 5.12.12
  # this is different from MACOSX_DEPLOYMENT_TARGET to prevent build problems
  # we set MACOSX_DEPLOYMENT_TARGET later
  MACOS_TARGET: 10.12
  