ci: Allow a manual trigger for the cucumber-update job

So we can troubleshoot / iterate faster than waiting for the daily cron,
and to make it easier to catch up multiple versions if we fall behind.

Author: acoulton

.github/workflows/update.yml

@@ -3,6 +3,7 @@ name: Update Cucumber
 on:
   schedule:
     - cron: '0 7 * * *'
+  workflow_dispatch:
 
 jobs:
   cucumber-update: