Run linting on Python 3.9 (#746)

Author: lgeiger

.github/workflows/lint.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Python 3.8
+      - name: Set up Python 3.9
         uses: actions/setup-python@v4
         with:
-          python-version: 3.8
+          python-version: 3.9
       - name: Install Lint Dependencies
         run: |
           pip install -r test-requirements.txt --no-cache-dir

setup.cfg

@@ -7,4 +7,4 @@ keep_going = True
 strict_import = True
 # Disable import errors since our pybind modules are not available during type check and we don't supply type stubs
 disable = import-error
-python_version = 3.8
+python_version = 3.9