test changes for 24.04 ubuntu github action migration

Remove ubuntu-22.04 explicitly. It was running 22.04 as both
ubuntu-latest and ubuntu-22.04. I had expected it to realise that was
a duplicate job (for latest == 22.04) and not run it.

[skip travis]

Author: rouilj

.github/workflows/ci-test.yml

@@ -65,7 +65,7 @@ jobs:
         #os: [ubuntu-latest, macos-latest, windows-latest]
         # ubuntu latest 22.04 12/2022
         # ubuntu latest 24.04 12/2024
-        os: [ubuntu-latest, ubuntu-22.04, ubuntu-20.04, ubuntu-24.04]
+        os: [ubuntu-latest, ubuntu-20.04, ubuntu-24.04]
 
         # if the ones above fail. fail the build
         experimental: [ false ]