Bump docker/build-push-action from 5 to 6 (#2971)

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

.github/workflows/release-update-repos.yml

@@ -491,7 +491,7 @@ jobs:
         password: ${{ secrets.DOCKERHUB_TOKEN }}
 
     - name: Build and export to Docker locally
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: docker
         load: true
@@ -538,15 +538,15 @@ jobs:
 
     - name: Push image if its from v8
       if: ${{ env.LATEST_DOCKER }} == v8
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: docker
         push: true
         tags: cloudfoundry/cli:${{ env.VERSION_BUILD }}, cloudfoundry/cli:latest
 
     - name: Push image if its from v7
       if: ${{ env.LATEST_DOCKER }} == v7
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: docker
         push: true