Revert to free macOS runners (#118744)

Author: ambv

.github/workflows/build.yml

@@ -208,7 +208,7 @@ jobs:
     with:
       config_hash: ${{ needs.check_source.outputs.config_hash }}
       # macos-14 is M1, macos-13 is Intel
-      os-matrix: '["macos-14-xlarge", "macos-13-large"]'
+      os-matrix: '["macos-14", "macos-13"]'
 
   build_macos_free_threading:
     name: 'macOS (free-threading)'
@@ -219,7 +219,7 @@ jobs:
       config_hash: ${{ needs.check_source.outputs.config_hash }}
       free-threading: true
       # macos-14-large is Intel with 12 cores (most parallelism)
-      os-matrix: '["macos-14-large"]'
+      os-matrix: '["macos-14"]'
 
   build_ubuntu:
     name: 'Ubuntu'