Merge pull request #265 from typelevel/fifteenth

Author: rossabaker

.github/workflows/update-flake.yml

@@ -2,7 +2,7 @@ name: update-flake
 on:
   workflow_dispatch: # allows manual triggering
   schedule:
-    - cron: '45 3 15-21 * 1' # runs the third Monday of the month at 03:45
+    - cron: '45 3 15 * *' # runs the 15th of the month at 03:45
 
 jobs:
   lockfile: