os.popen: add encoding argument for 3.11

python/cpython#92374

Author: JelleZijlstra

stdlib/os/__init__.pyi

@@ -861,7 +861,10 @@ class _wrap_close(_TextIOWrapper):
     def __init__(self, stream: _TextIOWrapper, proc: Popen[str]) -> None: ...
     def close(self) -> int | None: ...  # type: ignore[override]
 
-def popen(cmd: str, mode: str = ..., buffering: int = ...) -> _wrap_close: ...
+if sys.version_info >= (3, 11):
+    def popen(cmd: str, mode: str = ..., buffering: int = ..., encoding: str | None = ...) -> _wrap_close: ...
+else:
+    def popen(cmd: str, mode: str = ..., buffering: int = ...) -> _wrap_close: ...
 def spawnl(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: StrOrBytesPath) -> int: ...
 def spawnle(mode: int, file: StrOrBytesPath, arg0: StrOrBytesPath, *args: Any) -> int: ...  # Imprecise sig