chore: bump docker/bake-action from 5 to 6

Bumps [docker/bake-action](https://github.com/docker/bake-action) from 5 to 6.
- [Release notes](https://github.com/docker/bake-action/releases)
- [Commits](https://github.com/docker/bake-action/compare/v5...v6)

---
updated-dependencies:
- dependency-name: docker/bake-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/docker-test.yml

@@ -37,14 +37,14 @@ jobs:
           driver-opts: network=host
       -
         name: Build base image
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           files: ./docker-bake.hcl
           targets: image-test-base
           push: true
       -
         name: Build test image
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           files: ./docker-bake.hcl
           targets: image-test