fix: respect session verify attribute in ArtifactPath constructor

[heyncth]

WHAT

Fix Session 'verify' attribute being ignored when constructing ArtifactPath

Root Cause

When passing a requests.Session with verify=False to ArtifactPath(), the constructor ignores the session's verify setting and defaults to True (or the config file value). This happens in both __new__ (Python <3.12) and __init__ (Python >=3.12) methods.

Solution

When a session is provided but verify is not explicitly passed as a keyword argument, inherit the verify value from the session object instead of falling through to the hardcoded default. Explicit verify kwargs still take precedence over the session.

Test Plan

import requests
from artifactory import ArtifactoryPath

session = requests.Session()
session.verify = False
path = ArtifactoryPath("http://example.com/artifactory/libs-release-local/foo", session=session)
assert path.verify is False, "Session verify should be inherited"

Fixes #500