Update codeql.yml

Added workflow_dispatch:
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 36d8cf2..cb617e1 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -19,6 +19,7 @@
     branches: [ "master" ]
   schedule:
     - cron: '24 21 * * 5'
+  workflow_dispatch:
 
 jobs:
   analyze: