[3.15] gh-149474: use `Py_fopen` in `Binary{Reader,Writer}` for audit hook and path...

[3.15] gh-149474: use `Py_fopen` in `Binary{Reader,Writer}` for audit hook and path-like support (GH-149524) (#149586)

gh-149474: use `Py_fopen` in `Binary{Reader,Writer}` for audit hook and path-like support (GH-149524)
(cherry picked from commit 354ef336e4cd48cf0c02bc9a0c642adf5d543184)

Co-authored-by: Maurycy Pawłowski-Wieroński <maurycy@maurycy.com>