Bump docker/build-push-action from 5 to 6 (#1514)

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

.github/workflows/release.yml

@@ -210,15 +210,15 @@ jobs:
           registry: ${{ env.DOCKER_REGISTRY }}
       - name: Publish
         if: ${{ env.SKIP_BUILD != 'true' }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           context: .
           file: .maintain/docker/Dockerfile
           tags: ${{ env.DOCKER_REGISTRY }}/${{ github.repository }}:sha-${{ env.SHA }}
       - name: Publish with tag
         if: ${{ env.SKIP_BUILD != 'true' }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           context: .

.github/workflows/staging.yml

@@ -73,7 +73,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: ${{ env.DOCKER_REGISTRY }}
       - name: Publish docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           context: .