Merge pull request #633 from stan-dev/ci/py311

Add Python 3.11 to CI

Author: WardBrian

.github/workflows/main.yml

@@ -39,8 +39,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.7, 3.8, 3.9, "3.10.6"]
-        # more specific version of 3.10 due to https://github.com/python/mypy/issues/13627
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
     steps:
@@ -60,7 +59,7 @@ jobs:
           pip install codecov
 
       - name: Run flake8, pylint, mypy
-        if: matrix.python-version == '3.10.6'
+        if: matrix.python-version == '3.11'
         run: |
           flake8 cmdstanpy test
           pylint -v cmdstanpy test