Bump cgrindel/gha_join_jobs from 1.2.0 to 1.4.0

Bumps [cgrindel/gha_join_jobs](https://github.com/cgrindel/gha_join_jobs) from 1.2.0 to 1.4.0.
- [Release notes](https://github.com/cgrindel/gha_join_jobs/releases)
- [Commits](cgrindel/gha_join_jobs@794a2d1...8a9736c)

---
updated-dependencies:
- dependency-name: cgrindel/gha_join_jobs
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/workflow.yaml

@@ -150,6 +150,6 @@ jobs:
       - test-nixpkgs
     if: ${{ always() }}
     steps:
-      - uses: cgrindel/gha_join_jobs@794a2d117251f22607f1aab937d3fd3eaaf9a2f5 # v1
+      - uses: cgrindel/gha_join_jobs@8a9736c29a7e5ebd9f3af2870f59cb6d563b6659 # v1
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}