pipeline: upgrade runner from ubuntu v20.04 to v24.04

.github/workflows/python.yml

@@ -13,7 +13,7 @@ on:
 
 jobs:
   code-format:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: ['3.9']
@@ -29,7 +29,7 @@ jobs:
     - run: pipenv graph
     - run: pipenv run black --check .
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     strategy:
       matrix:
         python-version: