Fix 3.10 string

Author: dannyp11

.github/workflows/test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        python: [3.7, 3.8, 3.9, 3.10]
+        python: [3.7, 3.8, 3.9, '3.10']
 
     steps:
       - uses: actions/checkout@v3