GITHUB: upgrade mypy action to 22.04

Author: sipma

.github/workflows/run_mypy.yaml

@@ -5,7 +5,7 @@ on: [pull_request, push]
 jobs:
   run_mypy:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
     - uses: actions/checkout@v1