Update CI workflow to run on Ubuntu 24.04

20.04 is deprecated and will be removed soon

Author: evgeni

.github/workflows/build.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       fail-fast: false
       matrix: