remove references to "Text" in Python 3-only stubs (#4251)

stdlib/3/asyncio/subprocess.pyi

@@ -3,7 +3,7 @@ from asyncio import events
 from asyncio import protocols
 from asyncio import streams
 from asyncio import transports
-from typing import Any, Optional, Text, Tuple, Union, IO
+from typing import Any, Optional, Tuple, Union, IO
 
 if sys.version_info >= (3, 8):
     from os import PathLike
@@ -22,7 +22,7 @@ class SubprocessStreamProtocol(streams.FlowControlMixin,
     stderr: Optional[streams.StreamReader]
     def __init__(self, limit: int, loop: events.AbstractEventLoop) -> None: ...
     def connection_made(self, transport: transports.BaseTransport) -> None: ...
-    def pipe_data_received(self, fd: int, data: Union[bytes, Text]) -> None: ...
+    def pipe_data_received(self, fd: int, data: Union[bytes, str]) -> None: ...
     def pipe_connection_lost(self, fd: int, exc: Optional[Exception]) -> None: ...
     def process_exited(self) -> None: ...