fix Windows failures (take 2)

Author: picnixz

Lib/test/test_os/test_os.py

@@ -2666,8 +2666,8 @@ def test_execve_env_concurrent_mutation_with_fspath_windows(self):
         code = """
         import os, sys
 
-        assert list(os.environ.keys()) == ["SYSTEMROOT"]
-        assert list(os.environ.values()) == [{SYSTEMROOT!r}]
+        assert "SYSTEMROOT" in os.environ
+        assert os.environ["SYSTEMROOT"] == "{SYSTEMROOT!r}"
 
         class MyPath:
             def __fspath__(self):