Swift: fix quick tests action, again

Author: redsun82

swift/actions/create-extractor-pack/action.yml

@@ -4,7 +4,7 @@ runs:
   using: composite
   steps:
     - name: Run xcode-autobuilder tests
-      if: runner.os == "macOS"
+      if: runner.os == 'macOS'
       shell: bash
       run: |
         bazel test //swift/xcode-autobuilder/tests