Victoria Ashworth f223a37e77 Only run tests on macOS 12 (flutter/engine#47933) ...

There's an [issue](https://github.com/flutter/flutter/issues/138238) with mac_toolchain that makes Xcode installs flakey and an [issue](https://github.com/flutter/flutter/issues/138246) that makes Xcode installs more frequent on macOS 13, which is causing presubmit tests to fall frequently. In the meantime, we'll only have tests run on macOS 12.

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

2023-11-11 00:23:12 +00:00

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src/flutter

Only run tests on macOS 12 (flutter/engine#47933)

2023-11-11 00:23:12 +00:00