ci: Roll test-each-commit Ubuntu

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ env:
 jobs:
   test-each-commit:
     name: 'test each commit'
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-24.04
     if: github.event_name == 'pull_request' && github.event.pull_request.commits != 1
     timeout-minutes: 360  # Use maximum time, see https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idtimeout-minutes. Assuming a worst case time of 1 hour per commit, this leads to a --max-count=6 below.
     env: