Update the test matrix for GitHub

Author: zeroSteiner

.github/workflows/verify.yml

@@ -37,8 +37,10 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
+          - '3.4'
         os:
-          - ubuntu-20.04
+          - ubuntu-22.04
           - ubuntu-latest
         exclude:
           - { os: ubuntu-latest, ruby: '2.7' }