Bump runner to 22.04

Author: sabiwara

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
             os: ubuntu-latest
           - erlang: "24"
             elixir: "1.15"
-            os: ubuntu-20.04
+            os: ubuntu-22.04
 
     env:
       MIX_ENV: test