Fix types

[ci skip-build-wheels]

src/python/pants/bin/remote_pants_runner.py

@@ -6,7 +6,7 @@
 import termios
 import time
 from contextlib import contextmanager
-from typing import List, Mapping, cast
+from typing import List, Mapping
 
 import psutil
 
@@ -145,7 +145,7 @@ def signal_fn() -> bool:
             with ExceptionSink.trapped_signals(pantsd_signal_handler), STTYSettings.preserved():
                 try:
                     output = rust_nailgun_client.execute(signal_fn, command, args, modified_env)
-                    return cast(ExitCode, output)
+                    return output
 
                 # NailgunConnectionException represents a failure connecting to pantsd, so we retry
                 # up to the retry limit.

src/python/pants/engine/internals/native_engine.pyi

@@ -1,4 +1,4 @@
-from typing import Any
+from typing import Any, Callable, Dict, List
 
 # TODO: black and flake8 disagree about the content of this file:
 #   see https://github.com/psf/black/issues/1548
@@ -32,6 +32,12 @@ class PyGeneratorResponseGetMulti:
 class PyNailgunServer:
     def __init__(self, **kwargs: Any) -> None: ...
 
+class PyNailgunClient:
+    def __init__(self, **kwargs: Any) -> None: ...
+    def execute(
+        self, signal_fn: Callable, command: str, args: List[str], env: Dict[str, str]
+    ) -> int: ...
+
 class PyRemotingOptions:
     def __init__(self, **kwargs: Any) -> None: ...