[ntBre]

Summary

Python 3.15 adds the parent_mode argument to both os.makedirs and pathlib.Path.mkdir, which allows setting the mode for intermediate directories separately from the main mode argument. This PR adds support for the new argument in both non-octal-permissions (RUF064), which now checks this argument's permissions too, and in os-makedirs (PTH103), which just needs to recognize it for converting calls from the os to the pathlib versions.

As a note to head off other Codexes, my Codex keeps complaining about this fix being unsafe:

 import os
+import pathlib

 def create():
-    os.makedirs("a/b", parent_mode=(mode := 0o700), mode=mode)
+    pathlib.Path("a/b").mkdir(mode=mode, parents=True, parent_mode=(mode := 0o700))

because it reorders the arguments and could change the order of side effects. This is yet another preexisting issue with the way this rule and a couple of other PTH rules rewrite argument lists that hasn't been reported and isn't strictly related to the 3.15 changes. If we're really worried about that, we could just mark the fix unsafe, I guess.

Test Plan

New mdtests for both affected rules

[astral-sh-bot]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.