Add missing __match_args__ attributes to several unix-only structseq classes (#7587)

stdlib/spwd.pyi

@@ -1,11 +1,23 @@
 import sys
 from _typeshed import structseq
 from typing import Any
-from typing_extensions import final
+from typing_extensions import Final, final
 
 if sys.platform != "win32":
     @final
     class struct_spwd(structseq[Any], tuple[str, str, int, int, int, int, int, int, int]):
+        if sys.version_info >= (3, 10):
+            __match_args__: Final = (
+                "sp_namp",
+                "sp_pwdp",
+                "sp_lstchg",
+                "sp_min",
+                "sp_max",
+                "sp_warn",
+                "sp_inact",
+                "sp_expire",
+                "sp_flag",
+            )
         @property
         def sp_namp(self) -> str: ...
         @property