remove ubuntu 20.04, add 24.04

Author: ManifoldFR

.github/workflows/linux.yml

@@ -30,7 +30,7 @@ jobs:
     strategy:
       matrix:
         python: [3]
-        ubuntu: [20, 22]
+        ubuntu: [22, 24]
     steps:
       - uses: actions/checkout@v3
         with: