PYTHON-5974 - Fix Python 3.12 check for overload test bounds

[NoahStapp]

PYTHON-5974

Changes in this PR

Fix the <= 3.12 check in the test.

Test Plan

Checklist

Checklist for Author

• Did you update the changelog (if necessary)?
• Is there test coverage?
• Is any followup work tracked in a JIRA ticket? If so, add link(s).

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• Does the title of the PR reference a JIRA Ticket?
• Do you fully understand the implementation? (Would you be comfortable explaining how this code works to someone else?)
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[Copilot]

Pull request overview

Fixes a Python version guard in the client backpressure overload timing test so that the “Windows + Python 3.12.x” slack logic correctly applies to all 3.12 micro versions (not just 3.12.0), aligning the test’s bounds with intended behavior across supported runtimes.

Changes:

• Update the version comparison from sys.version_info <= (3, 12) (which excludes 3.12.1+) to sys.version_info < (3, 13) in the overload timing bound logic.
• Apply the same fix to both the asynchronous and generated synchronous variants of the test.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/test_client_backpressure.py	Fix Windows/Python version bound check so 3.12.x is handled correctly in timing slack logic.
test/asynchronous/test_client_backpressure.py	Same fix in the async source test to ensure consistent behavior for asyncio timing resolution on 3.12.x.

[blink1073]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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