Update to use proper ubuntu-latest for Github Actions

Author: craigthomas

.github/workflows/gradle.yml

@@ -2,7 +2,7 @@ name: Build Test Coverage
 on: [push, pull_request]
 jobs:
   run:
-    runs-on: ubuntu:latest
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout
       uses: actions/checkout@v6