feat(linux)!: drop support for Ubuntu 20.04 runner (#122)

Author: ReenigneArcher

.github/workflows/ci.yml

@@ -30,7 +30,6 @@ jobs:
           - macos-14
           - windows-2019
           - windows-2022
-          - ubuntu-20.04
           - ubuntu-22.04
           - ubuntu-24.04
         python: ["2.7", "3.11"]