Fix syntax in CodeQL code scanning workflow

Author: shati-patel

.github/workflows/codeql.yml

@@ -6,16 +6,16 @@ on:
   pull_request:
     branches: [main]
   schedule:
-    - cron: '0 0 * * 0'
+    - cron: '21 17 * * 0'
 
 jobs:
   codeql:
     runs-on: ubuntu-latest
 
     permissions:
       contents: read
-      security_events: write
-      pull_requests: read
+      security-events: write
+      pull-requests: read
 
     steps:
       - name: Checkout repository