Bump slackapi/slack-github-action in the actions group

Bumps the actions group with 1 update: [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action).


Updates `slackapi/slack-github-action` from 2.1.0 to 2.1.1
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v2.1.0...v2.1.1)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-version: 2.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/release_notice.yml

@@ -14,7 +14,7 @@ jobs:
         run: echo "$GITHUB_CONTEXT"
       - name: Send custom JSON data to Slack workflow
         id: slack
-        uses: slackapi/[email protected].0
+        uses: slackapi/[email protected].1
         with:
           # This data can be any valid JSON from a previous step in the GitHub Action
           payload: |