fixing expressions in github actions

Author: lmajano

.github/workflows/tests.yml

@@ -111,7 +111,7 @@ jobs:
 
       - name: Slack Notifications
         # Only on failures and NOT in pull requests
-        if: ${{ failure() && !startsWith( "pull_request", github.event_name ) }}
+        if: ${{ failure() && !startsWith( 'pull_request', github.event_name ) }}
         uses: rtCamp/action-slack-notify@v2
         env:
           SLACK_CHANNEL: coding