Upgrade black version (#7089)

stdlib/grp.pyi

@@ -14,6 +14,7 @@ if sys.platform != "win32":
         def gr_gid(self) -> int: ...
         @property
         def gr_mem(self) -> list[str]: ...
+
     def getgrall() -> list[struct_group]: ...
     def getgrgid(id: int) -> struct_group: ...
     def getgrnam(name: str) -> struct_group: ...