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

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


Updates `slackapi/slack-github-action` from 1.25.0 to 1.26.0
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Commits](slackapi/slack-github-action@v1.25.0...v1.26.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Slack notification
         # https://github.com/slackapi/slack-github-action
         id: slack
-        uses: slackapi/slack-github-action@v1.25.0
+        uses: slackapi/slack-github-action@v1.26.0
         with:
           channel-id: "dev-github"
           slack-message: "${{ github.repository }} - ${{ github.workflow }} workflow is ${{ job.status }} for ${{ github.base_ref || github.ref_name }} branch\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}"