Run on ubuntu-22.04

Author: mwilliamson

.github/workflows/tests.yml

@@ -4,11 +4,11 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     strategy:
       matrix:
-        python-version: ["2.7", "3.5", "3.6", "3.7", "3.8", "3.9", "pypy2.7", "pypy3.9"]
+        python-version: ["3.7", "3.8", "3.9", "pypy2.7", "pypy3.9"]
 
     steps:
 
@@ -24,7 +24,7 @@ jobs:
     - run: tox -e py
 
   docs:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     strategy:
       matrix: