Simplify Python version specification in GitHub Actions workflow to use "3.x"

Author: Vianpyro

.github/workflows/pytest.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.10", "3.11", "3.12", "3.13", "3.x"]
+        python-version: "3.x"
 
     steps:
     - name: Checkout code