quopri: improve types (#9074)

Author: JelleZijlstra

stdlib/quopri.pyi

@@ -1,8 +1,11 @@
-from typing import BinaryIO
+from _typeshed import ReadableBuffer, SupportsNoArgReadline, SupportsRead, SupportsWrite
+from typing import Protocol
 
 __all__ = ["encode", "decode", "encodestring", "decodestring"]
 
-def encode(input: BinaryIO, output: BinaryIO, quotetabs: int, header: int = ...) -> None: ...
-def encodestring(s: bytes, quotetabs: int = ..., header: int = ...) -> bytes: ...
-def decode(input: BinaryIO, output: BinaryIO, header: int = ...) -> None: ...
-def decodestring(s: bytes, header: int = ...) -> bytes: ...
+class _Input(SupportsRead[bytes], SupportsNoArgReadline[bytes], Protocol): ...
+
+def encode(input: _Input, output: SupportsWrite[bytes], quotetabs: int, header: int = ...) -> None: ...
+def encodestring(s: ReadableBuffer, quotetabs: int = ..., header: int = ...) -> bytes: ...
+def decode(input: _Input, output: SupportsWrite[bytes], header: int = ...) -> None: ...
+def decodestring(s: str | ReadableBuffer, header: int = ...) -> bytes: ...