Update macOS job name in CI workflow to target arm64 architecture

Author: perkss

.github/workflows/build_cmake.yml

@@ -10,7 +10,7 @@ env:
   CTEST_OUTPUT_ON_FAILURE: 1
 
 jobs:
-  macos-native-x86_64:
+  macos-native-arm64:
     name: 'macOS 15'
     # Use latest image, but hardcode version to avoid silent upgrades (and breaks).
     # See: https://github.com/actions/runner-images#available-images.