Update src/_pytest/capture.py

Co-authored-by: Sviatoslav Sydorenko (Святослав Сидоренко) <[email protected]>

Author: Pierre-Sassoulas

src/_pytest/capture.py

@@ -177,7 +177,8 @@ def name(self) -> str:
     def mode(self) -> str:
         # TextIOWrapper doesn't expose a mode, but at least some of our
         # tests check it.
-        return self.buffer.mode.replace("b", "")  # type: ignore[no-any-return,attr-defined]
+        assert hasattr(self.buffer, 'mode')
+        return cast(str, self.buffer.mode.replace("b", ""))
 
 
 class CaptureIO(io.TextIOWrapper):