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/docker.yml

@@ -30,7 +30,7 @@ jobs:
                     password: ${{ secrets.GITHUB_TOKEN }}
             -
                 name: Build and Export to Docker
-                uses: docker/build-push-action@v5
+                uses: docker/build-push-action@v6
                 with:
                     context: .
                     load: true
@@ -44,7 +44,7 @@ jobs:
                     docker run --rm ghcr.io/x-pt/example-py:${GITHUB_REF_NAME:1}
             -
                 name: Build and Push
-                uses: docker/build-push-action@v5
+                uses: docker/build-push-action@v6
                 with:
                     context: .
                     platforms: linux/amd64,linux/arm64