Bandit 1.7.5 false positive for request_without_timeout (B113)

Describe the bug

Bandit is incorrectly marking calls to requests library without a timeout while the code it's actually not calling directly the requests library and the timeout is already set elsewhere.

Reproduction steps

1. Define this code:

from mylibrary import my_session

class Repro:

    def __init__(self):
        self.requests = my_session(timeout=5)

    def get(self, uri):
        return self.requests.get(uri)

2. Run bandit: bandit -l -i -r --skip B404,B603 somepath/

3. Get an error:

>> Issue: [B113:request_without_timeout] Requests call without timeout
   Severity: Medium   Confidence: Low
   CWE: CWE-400 (https://cwe.mitre.org/data/definitions/400.html)
   More Info: https://bandit.readthedocs.io/en/1.7.5/plugins/b113_request_without_timeout.html
   Location: repro.py:10:15
9	    def get(self, uri):
10	        return self.requests.get(uri)
11

Expected behavior

Bandit should not report any error because the session has a default timeout set via an HTTPAdapter in another library.

The code calls self.requests that could be any kind of object, does bandit do code inspection of the object to detect that is actually a requests session?
I don't think so as it triggered the issue also with my pseudo code that doesn't import the real library.
If it was indeed doing introspection, it should probably also check if there is a default timeout set in the session.

Bandit version

1.7.5 (Default)

Python version

3.9,3.10

Additional context

[note] The dropdown menu of the issues template here on Github has a Python 3.1 version and is missing 3.10, possibly a typo in the template.

Start with Bandit's B113 request_without_timeout plugin and reproduce the report using the Python example and the documented bandit command. Read the plugin's existing behavior and tests, then determine the intended handling for calls on arbitrary session-like attributes. Done means the agreed behavior is covered by a regression test and the false-positive case is resolved.