Fix case involving non-ASCII chars on Windows (#17275)

Fixes #16669

One can replicate this error in Windows using Python3.8 just by calling
the mypy/pyinfo.py module using a slightly modified code of the
`get_search_dirs` function where the python executable doesn't match the
value of sys.executable. The only modification made to this code from
`get_search_dirs` is the adding of a non-ascii-path to the env parameter

mypy/pyinfo.py

@@ -71,6 +71,7 @@ def getsearchdirs() -> tuple[list[str], list[str]]:
 
 
 if __name__ == "__main__":
+ sys.stdout.reconfigure(encoding="utf-8") # type: ignore [attr-defined]
  if sys.argv[-1] == "getsearchdirs":
  print(repr(getsearchdirs()))
  else: