chore: bump docker/build-push-action from 4 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4...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]>

Author: dependabot[bot]

.github/workflows/image-push-main.yaml

@@ -31,7 +31,7 @@ jobs:
         with:
           images: ghcr.io/${{ steps.repo_name.outputs.repository }}
       - name: Build and push container image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true

.github/workflows/image-push-release.yaml

@@ -35,7 +35,7 @@ jobs:
           flavor: |
             latest=false
       - name: Build and push container image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: linux/amd64,linux/arm64