(AB-4960) Run expectations workflow every 30m (#89)

This change reduces the frequency the expectations GHA runs from
once every 10 minutes to once every 30 minutes to help reduce the
frequency of rate limiting.

Author: michaeltlombardi

.github/workflows/expectations.yml

@@ -5,7 +5,7 @@
 name: Commenting
 on:
   schedule:
-    - cron: 0/10 * * * *
+    - cron: 0/30 * * * *
 permissions:
   contents: read
   pull-requests: write