Remove macos-13 runner from bootstrap testing (#25843)

.github/workflows/bootstrap_testing.yml

@@ -161,7 +161,6 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - macos-13        # Intel x64
           - macos-14        # Apple Silicon ARM64
           - macos-15        # Apple Silicon ARM64
           - macos-15-intel  # Intel x64