Pin specific version of the Gutenberg plugin.

Author: desrosj

.github/workflows/end-to-end-tests.yml

@@ -65,6 +65,7 @@ jobs:
         LOCAL_SCRIPT_DEBUG: [ true, false ]
     with:
       LOCAL_SCRIPT_DEBUG: ${{ matrix.LOCAL_SCRIPT_DEBUG }}
+      gutenberg-version: '22.3.0'
 
   slack-notifications:
     name: Slack Notifications