chore(deps): update slackapi/slack-github-action action to v2.1.1 (#1122)

Co-authored-by: grafanarenovatebot[bot] <146220760+grafanarenovatebot[bot]@users.noreply.github.com>

Author: grafanarenovatebot[bot]

actions/send-slack-message/action.yaml

@@ -46,7 +46,7 @@ runs:
           SLACK_BOT_TOKEN=slack-notifications:oauth-token
     - name: Send Slack Message
       id: send-slack-message
-      uses: slackapi/slack-github-action@b0fa283ad8fea605de13dc3f449259339835fc52 # v2.1.0
+      uses: slackapi/slack-github-action@91efab103c0de0a537f72a35f6b8cda0ee76bf0a # v2.1.1
       with:
         payload-templated: ${{ inputs.payload-templated }}
         method: ${{ inputs.method }}