.github: secure ubuntu version to 24.04

Author: jjokella

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ concurrency:
 
 jobs:
   deploy-docs:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}