[5.2.x] Fixed CVE-2026-25674 -- Prevented potentially incorrect permissions on file system object creation.

This fix introduces `safe_makedirs()` in the `os` utils as a safer
alternative to `os.makedirs()` that avoids umask-related race conditions
in multi-threaded environments.

This is a workaround for https://github.com/python/cpython/issues/86533
and the solution is based on the fix being proposed for CPython.

Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Refs CVE-2020-24583 and #31921.

Thanks Tarek Nakkouch for the report, and Jake Howard, Jacob Walls, and
Shai Berger for reviews.

Backport of 019e44f67a8dace67b786e2818938c8691132988 from main.

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