Fix typo

Author: perovskite

tests/test_anywidget.py

@@ -8,7 +8,7 @@
 from panel.io.server import serve
 from playwright.sync_api import expect, Page
 
-if sys.platfrom.startswith("win"):
+if sys.platform.startswith("win"):
     pytest.skip(reason="Skipping E2E tests on Windows.", allow_module_level=True)