Disable parallel testing to see if the tests stabilize

Author: cmcgee1024

.github/workflows/pull_request.yml

@@ -37,7 +37,7 @@ jobs:
       - name: Prepare the action
         run: ./scripts/prep-gh-action.sh --install-swiftly
       - name: Build and Test
-        run: swift test
+        run: swift test --no-parallel
 
   releasebuildcheck:
     name: Release Build Check