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/charts.yaml

@@ -53,15 +53,15 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build API Docker Image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./api/
           target: prod
           load: true
           tags: ghcr.io/${{ github.repository_owner }}/outdated/api:latest
 
       - name: Build Ember Docker Image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./ember/
           load: true

.github/workflows/release.yaml

@@ -91,7 +91,7 @@ jobs:
             org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
 
       - name: Build and Push API Docker Image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         id: docker
         with:
           context: ./api/
@@ -163,7 +163,7 @@ jobs:
             org.opencontainers.image.licenses=${{ github.event.repository.license.spdx_id }}
 
       - name: Build and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         id: docker
         with:
           context: ./ember/