PYTHON-5062 Add GitHub Actions CodeQL scanning (#2079)

Author: blink1073

.github/workflows/codeql.yml

@@ -34,6 +34,8 @@ jobs:
           build-mode: manual
         - language: python
           build-mode: none
+        - language: actions
+          build-mode: none
     steps:
     - name: Checkout repository
       uses: actions/checkout@v4