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] <[email protected]>

.github/workflows/release.yml

@@ -219,15 +219,15 @@ jobs:
             echo "${tag%-*}=${tag##*-}" >>"$GITHUB_OUTPUT"
           done
 
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         if: ${{ steps.get_tags.outputs.goldboot != '' }}
         with:
           context: goldboot
           platforms: linux/amd64,linux/arm64 #,linux/arm/v7
           push: true
           tags: fossable/goldboot:latest,fossable/goldboot:${{ steps.get_tags.outputs.goldboot }}
 
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         if: ${{ steps.get_tags.outputs.goldboot-registry != '' }}
         with:
           context: goldboot-registry