git actions updated

Author: walnutflat

.github/workflows/python-tests.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ '3.7', '3.8', '3.9', '3.10',]
+        python-version: [ '3.7', '3.8', '3.9', '3.10']
         aioredis-version: [ 1.2.0, 2.0.0 ]
         exclude:
           - python-version: '3.10'