chore: update slackapi/slack-github-action action to v2.1.0

Author: renovate[bot]

.github/workflows/MERGE_MASTER_TO_DEVELOP.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Notify failure on Slack
         if: failure()
-        uses: slackapi/slack-github-action@v2.0.0
+        uses: slackapi/slack-github-action@v2.1.0
         with:
           method: chat.postMessage
           token: ${{ secrets.SLACK_BOT_TOKEN }}