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>

Author: dependabot[bot]

.github/workflows/clingo.yml

@@ -130,7 +130,7 @@ jobs:
       - uses: docker/setup-buildx-action@v3
 
       # Build and eventually push to registry
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           file: ./clingo/Dockerfile.manylinux2014
           platforms: linux/arm64,linux/ppc64le,linux/amd64

.github/workflows/gnupg.yml

@@ -85,7 +85,7 @@ jobs:
       - uses: docker/setup-buildx-action@v3
 
       # Build and eventually push to registry
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           file: ./gnupg/Dockerfile.manylinux2014
           platforms: linux/arm64,linux/ppc64le,linux/amd64

.github/workflows/patchelf.yml

@@ -46,7 +46,7 @@ jobs:
       - uses: docker/setup-buildx-action@v3
 
       # Build and eventually push to registry
-      - uses: docker/build-push-action@v5
+      - uses: docker/build-push-action@v6
         with:
           file: ./patchelf/Dockerfile.manylinux2014
           platforms: linux/arm64,linux/ppc64le,linux/amd64