Big diff: use lower-case list and dict (#5888)

stdlib/grp.pyi

@@ -1,11 +1,11 @@
-from typing import List, NamedTuple
+from typing import NamedTuple
 
 class struct_group(NamedTuple):
     gr_name: str
     gr_passwd: str | None
     gr_gid: int
-    gr_mem: List[str]
+    gr_mem: list[str]
 
-def getgrall() -> List[struct_group]: ...
+def getgrall() -> list[struct_group]: ...
 def getgrgid(id: int) -> struct_group: ...
 def getgrnam(name: str) -> struct_group: ...