Bump slackapi/slack-github-action from 1.25.0 to 1.27.0 (#1218)

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.25.0 to 1.27.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.25.0...v1.27.0)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/sync-readme-changelog.yml

@@ -39,7 +39,7 @@ jobs:
             --data "$payload"
 
     - name: Announce New Release in Slack
-      uses: slackapi/slack-github-action@v1.25.0
+      uses: slackapi/slack-github-action@v1.27.0
       with:
         channel-id: "C063MQJMKJN" #sdk-releases
         payload: |