chore: Build Python 3.9 wheels for Mac OS and Windows

Author: Stranger6667

.github/workflows/python-release.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, windows-latest]
-        python-version: ['3.5', '3.6', '3.7', '3.8']
+        python-version: ['3.5', '3.6', '3.7', '3.8', '3.9']
         architecture: [x86, x64]
         exclude:
         - os: macos-latest