ci: test with 3.11 in all OSes (#152)

Author: skshetry

.github/workflows/tests.yaml

@@ -21,10 +21,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-20.04, windows-latest, macos-latest]
-        pyv: ['3.8', '3.9', '3.10']
+        pyv: ['3.8', '3.9', '3.10', '3.11']
         include:
         - {os: ubuntu-latest, pyv: 'pypy3.8'}
-        - {os: ubuntu-latest, pyv: '3.11.0-rc - 3.11', nox_pyv: '3.11'}
 
     steps:
     - name: Check out the repository