Update Security-Notification.yml

Update SLACK_WEBHOOK environment

Author: antoniomorello-DB

.github/workflows/Security-Notification.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Send Slack Notification
         uses: rtCamp/action-slack-notify@v2
         env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
 
           SLACK_CHANNEL: '#docs-devdocs-notifications'
           SLACK_USERNAME: Dependabot Alert