Bump dagger/dagger-for-github from 6 to 7 (#260)

Bumps [dagger/dagger-for-github](https://github.com/dagger/dagger-for-github) from 6 to 7.
- [Release notes](https://github.com/dagger/dagger-for-github/releases)
- [Commits](dagger/dagger-for-github@v6...v7)

---
updated-dependencies:
- dependency-name: dagger/dagger-for-github
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/container-ci.yml

@@ -60,7 +60,7 @@ jobs:
           docker system prune -af
 
       - name: Integration Test
-        uses: dagger/dagger-for-github@v6
+        uses: dagger/dagger-for-github@v7
         with:
           workdir: ci
           verb: call