Update unittests.yml

.github/workflows/unittests.yml

@@ -1,6 +1,3 @@
-# This workflow will install Python dependencies, run tests and lint with a single version of Python
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
-
 name: Unit tests
 
 on:
@@ -17,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8, 3.9, 3.10, 3.11]
+        python-version: [3.8, 3.9, "3.10", 3.11]
 
     steps:
     - uses: actions/checkout@v3