Update CodeQL to v4. (#2816)

Author: janiversen

.github/workflows/ci.yml

@@ -101,10 +101,10 @@ jobs:
     timeout-minutes: 10
     steps:
       - uses: actions/[email protected]
-      - uses: github/codeql-action/init@v3
+      - uses: github/codeql-action/init@v4
         with:
           languages: python
-      - uses: github/codeql-action/analyze@v3
+      - uses: github/codeql-action/analyze@v4
 
   ci_complete:
     name: ci_complete