[Misc] Increase tolerance for clock monotonic test

[hughperkins]

Issue: #

Brief Summary

copilot:summary

Walkthrough

copilot:walkthrough

[claude]

LGTM — simple constant bump to reduce test flakiness.

Extended reasoning...

Overview

Single-line change in a test file: increases the LCG iteration count from 50 000 to 200 000 in test_clock_accuracy to give the clock-counter measurements more headroom against timing noise.

Security risks

None — this is a test-only change with no production code paths affected.

Level of scrutiny

Minimal scrutiny needed. The change is a pure numeric constant adjustment in a test, following the existing pattern of the function. It does not alter logic, APIs, or any production code.

Other factors

No bugs found by the bug-hunting system. No prior reviews on this PR. The intent (reduce flakiness) is clear and the change is proportionate.