Fix flaky TypeScriptClientKotlinServerTest

[kpavlov]

Describe the bug
TypeScriptClientKotlinServerTest fails on GitHub actions from time to time

To Reproduce

One may collect logs from GH

Expected behavior
Tests passing 100% runs

Logs

https://github.com/modelcontextprotocol/kotlin-sdk/actions/runs/17668237520/attempts/1