Double quotes on Python version

Author: gnikit

.github/workflows/main.yml

@@ -37,7 +37,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: 3.10
+          python-version: "3.10"
 
       - name: Coverage report
         run: |