Fix typo in workflow

Author: scaramallion

.github/workflows/pytest-builds.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
         os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps: