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/build.yaml

@@ -82,7 +82,7 @@ jobs:
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
 
       - name: Build and push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           # Build image for verification purposes on every trigger event. Only push if event is not a PR

.github/workflows/helm-lint.yaml

@@ -56,7 +56,7 @@ jobs:
           version: v0.20.0
           node_image: ${{ github.event.inputs.node_image || 'kindest/node:v1.24.6' }}
       - name: Build image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: true