Unschedule v0 maintenance work (#4120)

Author: kddejong

.github/workflows/maintenance-v0.yaml

@@ -1,7 +1,5 @@
 name: Automated Maintenance v0
 on:
-  schedule:
-    - cron: "0 0,12 * * *"
   workflow_dispatch: # Enables on-demand/manual triggering: https://docs.github.com/en/free-pro-team@latest/actions/managing-workflow-runs/manually-running-a-workflow
 jobs:
   job: