Update test.yml (#11)

https://github.blog/changelog/2025-01-15-github-actions-ubuntu-20-runner-image-brownout-dates-and-other-breaking-changes/

Author: dunningdan

.github/workflows/test.yml

@@ -16,7 +16,7 @@ concurrency:
 jobs:
   test:
     name: Test Cookiecutter Package
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     strategy:
       matrix: