Align macOS version with builds.yml with *-tests files.

Author: w-goog

.github/workflows/builds.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [macos-latest]
+        os: [macos-15]
 
     steps:
     - uses: actions/checkout@v3