Bump tj-actions/branch-names from 7 to 8

Bumps [tj-actions/branch-names](https://github.com/tj-actions/branch-names) from 7 to 8.
- [Release notes](https://github.com/tj-actions/branch-names/releases)
- [Changelog](https://github.com/tj-actions/branch-names/blob/main/HISTORY.md)
- [Commits](https://github.com/tj-actions/branch-names/compare/v7...v8)

---
updated-dependencies:
- dependency-name: tj-actions/branch-names
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/ci.yml

@@ -186,7 +186,7 @@ jobs:
           name: poseidon
       - name: Get current branch name
         id: branch-name
-        uses: tj-actions/branch-names@v7
+        uses: tj-actions/branch-names@v8
       - name: Checkout matching branch for Dockerfiles (optional)
         id: checkout-dockerfiles
         if: steps.branch-name.outputs.is_default == 'false'