Update runners to ubuntu-24.04 from deprecated ubuntu-20.04 label

Author: billnapier

.github/workflows/sonar.yml

@@ -13,7 +13,7 @@ jobs:
   sonar:
     if: github.repository == 'GoogleContainerTools/jib-extensions' # Only run on upstream branch
     name: Build with Sonar
-    runs-on: ubuntu-20.04
+    runs-on: 'ubuntu-24.04'
     steps:
       - name: Get current date
         id: date