Update runner image to ubuntu-latest

Author: Hapix

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
         python-version: ["3.9", "3.10", "3.11"]
         include:
           - os: Ubuntu
-            image: ubuntu-20.04
+            image: ubuntu-latest
       fail-fast: false
     defaults:
       run: