Update .github/workflows/slack.yml

Signed-off-by: Saurabh Singh <saurabhsraghuvanshi@gmail.com>

Author: saurabhraghuvanshii

.github/workflows/slack.yml

@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Notify Slack
-        uses: slackapi/slack-github-action@v2
+        uses: slackapi/slack-github-action@v2.1.1
         with:
           method: chat.postMessage
           token: ${{ secrets.SLACK_BOT_TOKEN }}