Update codeql.yml

Author: warrenackerman

.github/workflows/codeql.yml

@@ -17,8 +17,7 @@ on:
   pull_request:
     # The branches below must be a subset of the branches above
     branches: [ "main" ]
-  schedule:
-    - cron: '44 20 * * 0'
+  workflow_dispatch:
 
 permissions:
   actions: read