Fix release-libs charmcraft channel (#591)

Author: carlcsaposs-canonical

.github/workflows/release.yaml

@@ -32,6 +32,7 @@ jobs:
       - name: Release charm libraries
         uses: canonical/charming-actions/[email protected]
         with:
+          charmcraft-channel: latest/candidate  # TODO: remove after charmcraft 3.3 stable release
           credentials: ${{ secrets.CHARMHUB_TOKEN }}
           github-token: ${{ secrets.GITHUB_TOKEN }}