[CI]: TestContainerRmIptables fails binding on port #4347

Description

Happens regularly on the CI.

The intriguing part is that the port is obtained through portlock, so...

Steps to reproduce the issue

Describe the results you received and expected

Not flake.

What version of nerdctl are you using?

main

Are you using a variant of nerdctl? (e.g., Rancher Desktop)

None

Host information

No response