build(deps): bump slackapi/slack-github-action from 1.26.0 to 1.27.0

Bumps [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action) from 1.26.0 to 1.27.0.
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.26.0...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] <support@github.com>

.github/workflows/ci_compatible.yml

@@ -143,7 +143,7 @@ jobs:
 
  - name: Post to a Slack channel
  if: contains(fromJSON('["schedule", "workflow_dispatch"]'), github.event_name)
- uses: slackapi/slack-github-action@v1.26.0
+ uses: slackapi/slack-github-action@v1.27.0
  with:
  # channel-id: C02NJMSLFJR # alerts-ecosystem-ci
  # For posting a rich message using Block Kit - https://app.slack.com/block-kit-builder