chore(deps): bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/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
...

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

.github/workflows/next-build.yml

@@ -60,7 +60,7 @@ jobs:
           TAG: next
 
       - name: "Build and push"
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: ./build/dockerfiles/Dockerfile

.github/workflows/pr-checks.yml

@@ -56,7 +56,7 @@ jobs:
         docker load -i ./caches/app.tar | true
 
     - name: Build devfile registry
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: .
         file: ./build/dockerfiles/Dockerfile
@@ -69,7 +69,7 @@ jobs:
         provenance: false
 
     - name: Build offline devfile registry
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: .
         file: ./build/dockerfiles/Dockerfile