[infra] Support macOS SDKs > 11
[infra] Support macOS SDKs > 11

Inspired by https://crrev.com/cdd96213435c7cb21042e84720d9343ca35b37cf

Cq-Include-Trybots: luci.dart.try:dart-sdk-mac-try,vm-kernel-mac-release-x64-try,vm-kernel-mac-release-arm64-try
Change-Id: I209b279ca2066c8597170f552e9a5e98a4daf1b3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/219790
Reviewed-by: William Hesse <a821cddceae7dc400f272e3cb1a72f400f9fed6d@google.com>
Commit-Queue: Alexander Thomas <29642742b6693024c89de8232f2e2542cf7eedf7@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk