message: Go back to 5.12.10
diff: @@ -8,7 +8,7 @@ on: [push, pull_request]
  env:
  BUILD_TYPE: Release
  - QT_VERSION: 5.15.2
  + QT_VERSION: 5.12.10
  # this is different from MACOSX_DEPLOYMENT_TARGET to prevent build problems
  # we set MACOSX_DEPLOYMENT_TARGET later
  MACOS_TARGET: 10.12
  