Fix GitHub action for testing

Author: Cito

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11', 'pypy3.9']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', 'pypy3.9']
 
     steps:
       - uses: actions/checkout@v3