bump coverage runner to 24.04

Author: simbabque

.github/workflows/dzil-build-and-test.yml

@@ -32,7 +32,7 @@ jobs:
         if: ${{ github.actor != 'nektos/act' }}
   coverage-job:
     needs: build-job
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     container:
       image: perldocker/perl-tester:5.34
     steps: