Bump dokku/github-action from 1.3.0 to 1.6.0

Bumps [dokku/github-action](https://github.com/dokku/github-action) from 1.3.0 to 1.6.0.
- [Release notes](https://github.com/dokku/github-action/releases)
- [Commits](dokku/github-action@v1.3.0...v1.6.0)

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

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

.github/workflows/test-and-deploy.yml

@@ -54,7 +54,7 @@ jobs:
           fetch-depth: 0
 
       - name: Push
-        uses: dokku/github-action@v1.3.0
+        uses: dokku/github-action@v1.6.0
         # enable verbose ssh output
         with:
           branch: "main"