Flaky test on N|Solid 20 MacOS

[KaKa]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the issue has not already been raised

Issue

I often see N|Solid 20 MacOS test are failing in the first / second run but success later on.
The node@20 is successful in all variant.

[KaKa]

Some Reference
https://github.com/fastify/fastify/actions/runs/8797599941
https://github.com/fastify/fastify/actions/runs/8767776142

[Gürgün Dayıoğlu]

In fact on MacOS test/close-pipelining.test.js is flaky in all versions

https://github.com/fastify/fastify/actions/runs/8798010153/job/24144255184#step:5:1174