Bump docker/build-push-action from 5 to 6 in the all-dependencies group

Bumps the all-dependencies group with 1 update: [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `docker/build-push-action` from 5 to 6
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all-dependencies
...

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

.github/workflows/publish.yml

@@ -86,7 +86,7 @@ jobs:
           images: kinto/kinto-server
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./Dockerfile

.github/workflows/test.yml

@@ -179,7 +179,7 @@ jobs:
           install: true
 
       - name: Build container
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           cache-from: type=local,src=${{ env.DOCKER_CACHE}}
           cache-to: type=local,dest=${{ env.DOCKER_CACHE}},mode=max