Enable parallel testing again

Author: rrooij

.github/workflows/python.yml

@@ -30,7 +30,6 @@ jobs:
     env:
       TERMINUSX_TOKEN: ${{ secrets.TERMINUSX_TOKEN_DEV }}
     strategy:
-      max-parallel: 1
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10"]