ci: set parameters for codeql workflow (#226)

Author: eyurtsev

.github/workflows/codeql.yml

@@ -13,11 +13,11 @@ name: "CodeQL Advanced"
 
 on:
   push:
-    branches: [ $default-branch, $protected-branches ]
+    branches: [ main ]
   pull_request:
-    branches: [ $default-branch, $protected-branches ]
+    branches: [ main ]
   schedule:
-    - cron: $cron-weekly
+    - cron: '34 14 * * 1'
 
 jobs:
   analyze: