Small fit to when the job runs

Author: lwasser

.github/workflows/update-contribs-reviews.yml

@@ -3,8 +3,8 @@ name: Update Contribs & reviewers
 on:
   workflow_dispatch:
   schedule:
-    # Runs every other Sunday at 00:00 UTC (see https://crontab.guru)
-    - cron: "0 0 * * 0/2"
+    # Runs on the 1 and 15 of each month at 00:00 UTC (see https://crontab.guru)
+    - cron: "0 0 1,15 * *"
 jobs:
   run-meta:
     runs-on: ubuntu-latest