ci: maybe 22.04 works better

Author: carlosmn

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
-        os: [ ubuntu-20.04 ]
+        os: [ ubuntu-22.04 ]
     runs-on: ${{ matrix.os }}
 
     name: Ruby ${{ matrix.ruby }} on ${{ matrix.os }}