Use ubuntu-latest

20.04 was retired 2025-04-15

Author: joshcooper

.github/workflows/task_acceptance_tests.yaml

@@ -12,7 +12,7 @@ jobs:
     name: On ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ 'ubuntu-20.04', 'rocky-8' ]
+        os: [ 'ubuntu-latest', 'rocky-8' ]
 
     env:
       ruby_version: '3.1'