Revert Ubuntu to 22.04 as recent Update could be responsible for failing tests (actions/runner-images#10636)

Author: davue

.github/workflows/ruby.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix: