ci: fix CodeQL's agent scan (#1002)

Fix agent build scan by pinning runner to ubuntu-22.04. ubuntu-24.04,
which is what ubuntu-latest has recently become, doesn't have agent's
build dependency (libpcre3-dev) installed.

Author: lavarou

.github/workflows/codeql.yml

@@ -16,7 +16,7 @@ jobs:
     #   - https://gh.io/supported-runners-and-hardware-resources
     #   - https://gh.io/using-larger-runners
     # Consider using larger runners for possible analysis time improvements.
-    runs-on: 'ubuntu-latest'
+    runs-on: 'ubuntu-22.04'
     timeout-minutes: 360
     permissions:
       # required for all workflows