add other OS

Author: karangattu

.github/workflows/pytest.yaml

@@ -59,7 +59,7 @@ jobs:
     strategy:
       matrix:
         python-version: ["3.12", "3.11", "3.10", "3.9", "3.8"]
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
       fail-fast: false
 
     steps: