Actionlint fails on ubuntu-slim, so try ubuntu-24.04

Author: mhucka

.github/workflows/ci.yaml

@@ -180,7 +180,7 @@ jobs:
 
   action-lint:
     name: GitHub Actions lint checks
-    runs-on: ubuntu-slim
+    runs-on: ubuntu-24.04
     timeout-minutes: 15
     steps:
       - name: Check out a copy of the git repository