Bump mypy to 1.11.1 (#12463)

stubs/pexpect/pexpect/popen_spawn.pyi

@@ -23,7 +23,7 @@ class PopenSpawn(SpawnBase[AnyStr]):
         preexec_fn: Callable[[], None] | None = None,
     ) -> None: ...
     flag_eof: bool
-    def read_nonblocking(self, size, timeout): ...
+    def read_nonblocking(self, size, timeout): ...  # type: ignore[override]
     def write(self, s) -> None: ...
     def writelines(self, sequence) -> None: ...
     def send(self, s): ...