ci: 🎡 ubuntu-20.04 -> ubuntu-latest

Author: ZhaoQi99

.github/workflows/main.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-13, windows-latest]
+        os: [ubuntu-latest, macos-13, windows-latest]
         python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12","3.13"]
         exclude:
           - os: windows-latest