chore: update ubuntu deprecated version in main.yaml

Author: softvar

.github/workflows/main.yaml

@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         os:
-          - ubuntu-20.04
+          - ubuntu-22.04
         python-version: [ 3.6.7, 3.6.10, 3.6.14, 3.7.5, 3.7.11, 3.8.0, 3.8.5, 3.9.0, 3.9.6, 3.9.18, 3.10.13, 3.11.6]
 
     steps: