Revert back to Xcode 13 on master.yml

Keep using Xcode 13 until CP releases the fix for watchOS verification
on Xcode 14:
- CocoaPods/CocoaPods#11558
- CocoaPods/CocoaPods#11660

.github/workflows/master.yml

@@ -10,7 +10,10 @@ on:
       - master
 
 env:
-  DEVELOPER_DIR: /Applications/Xcode_14.1.app/Contents/Developer
+  # Keep using Xcode 13 until CP releases the fix for watchOS verification on Xcode 14
+  # https://github.com/CocoaPods/CocoaPods/issues/11558
+  # https://github.com/CocoaPods/CocoaPods/pull/11660
+  DEVELOPER_DIR: /Applications/Xcode_13.4.1.app/Contents/Developer
 
 name: Verification | Release
 jobs:
@@ -60,7 +63,7 @@ jobs:
           # `.swift-version` is for swiftenv, not for CocoaPods, so we can't remove the file as suggested.
           rm .swift-version
           pod repo update
-          pod lib lint --use-libraries --allow-warnings
+          pod lib lint --use-libraries
 
   release-github:
     if: startsWith(github.ref, 'refs/tags/')
@@ -84,4 +87,4 @@ jobs:
       - name: pod trunk push
         env:
           COCOAPODS_TRUNK_TOKEN: ${{ secrets.COCOAPODS_TRUNK_TOKEN }}
-        run: pod trunk push --allow-warnings
+        run: pod trunk push