Add py39 windows action - there are active contributors with this platform/version

Author: softwareengineerprogrammer

.github/workflows/github-actions.yml

@@ -50,6 +50,12 @@ jobs:
             python_arch: 'x64'
             tox_env: 'py39'
             os: 'macos-latest'
+          - name: 'py39 (windows)'
+            python: '3.9'
+            toxpython: 'python3.9'
+            python_arch: 'x64'
+            tox_env: 'py39'
+            os: 'windows-latest'
           - name: 'py310 (ubuntu)'
             python: '3.10'
             toxpython: 'python3.10'