Bump docker/build-push-action from 5 to 6 (#454)

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

Author: dependabot[bot]

.github/workflows/cnf-test-partner-image.yaml

@@ -68,7 +68,7 @@ jobs:
           password: ${{ secrets.QUAY_ROBOT_TOKEN }}
 
       - name: 'Build and push the new `cnf-test-partner` image(s)'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: ${{ env.IMAGE_CONTAINER_FILE_PATH }}

.github/workflows/debug-partner-image.yaml

@@ -77,7 +77,7 @@ jobs:
             type=semver,pattern={{version}}
 
       - name: 'Build and push the new `debug-partner` image'
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: ${{ env.IMAGE_CONTAINER_FILE_PATH }}