Replace Ubuntu 20.04 with 22.04

Context:
> This is a scheduled Ubuntu 20.04 retirement. Ubuntu 20.04 LTS runner will be removed on 2025-04-15. For more details, see actions/runner-images#11101

Author: flavioheleno

.github/workflows/ci.yml

@@ -2,7 +2,7 @@ name: CI
 on: [push, pull_request, workflow_dispatch]
 jobs:
   run:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
       matrix: