[docker] Fix Container.attach() return type

Signed-off-by: Emmanuel Ferdman <emmanuelferdman@gmail.com>

Author: emmanuel-ferdman

stubs/docker/@tests/test_cases/check_attach.py

@@ -1,8 +1,11 @@
 from __future__ import annotations
 
-from docker.models.containers import Container
+from typing_extensions import assert_type
 
+from docker.models.containers import Container
 
-def check_attach_stream(c: Container) -> None:
-    for line in c.attach(stdout=True, stderr=True, stream=True, logs=True):
-        line.decode("utf-8")
+c: Container
+assert_type(c.attach(), bytes)
+assert_type(c.attach(stream=False), bytes)
+for line in c.attach(stream=True):
+    assert_type(line, bytes)