chore(deps): bump docker/build-push-action from 4 to 6 (atuinsh#2296)

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

.github/workflows/docker.yaml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Release build
         id: release_build
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           outputs: "type=registry,push=true"
           platforms: linux/amd64
@@ -92,7 +92,7 @@ jobs:
 
       - name: Release build
         id: release_build
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           outputs: "type=registry,push=true"
           platforms: linux/arm64