Bump docker/build-push-action from 5.4.0 to 6.0.0 (#1777)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.4.0 to 6.0.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v5.4.0...v6.0.0)

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

.github/workflows/docker-pr.yml

@@ -13,7 +13,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4.1.6
       - name: Build Docker image
-        uses: docker/build-push-action@v5.4.0
+        uses: docker/build-push-action@v6.0.0
         with:
           context: .
           push: false

.github/workflows/prod-deploy.yml

@@ -90,7 +90,7 @@ jobs:
             ${{ secrets.DOCKER_USERNAME }}/cinny
             ghcr.io/${{ github.repository }}
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5.4.0
+        uses: docker/build-push-action@v6.0.0
         with:
           context: .
           platforms: linux/amd64,linux/arm64