Fix check-libs charmcraft channel (#583)

Author: carlcsaposs-canonical

.github/workflows/ci.yaml

@@ -49,6 +49,7 @@ jobs:
       - name: Check libs
         uses: canonical/charming-actions/[email protected]
         with:
+          charmcraft-channel: latest/beta/data-platform  # TODO: remove after charmcraft 3.3 stable release
           credentials: ${{ secrets.CHARMHUB_TOKEN }}
           github-token: ${{ secrets.GITHUB_TOKEN }}
           use-labels: false