Update lint workflow to ubuntu-24.04

Ubuntu 20.04 was the old default and is no longer supported by GitHub Actions

Author: allrob23

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ permissions:
 
 jobs:
   lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     timeout-minutes: 10
 
     steps: