some mypy fixes

Author: Carreau

.pre-commit-config.yaml

@@ -51,6 +51,7 @@ repos:
             "ipython>=8.16.1",
             "jupyter_client>=8.5",
             "appnope",
+            "types-psutil",
           ]
 
   - repo: https://github.com/adamchainz/blacken-docs

ipykernel/kernelapp.py

@@ -514,7 +514,7 @@ def init_io(self):
                         isinstance(handler, StreamHandler)
                         and (buffer := getattr(handler.stream, "buffer", None))
                         and (fileno := getattr(buffer, "fileno", None))
-                        and fileno() == sys.stderr._original_stdstream_fd  # type:ignore[attr-defined]
+                        and fileno() == sys.stderr._original_stdstream_fd
                     ):
                         self.log.debug("Seeing logger to stderr, rerouting to raw filedescriptor.")
                         io_wrapper = TextIOWrapper(