do not use Linux Ephemeral ports in tests

[yellowhatter]

Sometimes this causes tests to fail because of port collision

[github-actions]

PR missing one of the required labels: {'enhancement', 'documentation', 'dependencies', 'bug', 'internal', 'breaking-change', 'new feature'}

[oteffahi]

@yellowhatter could you please also update the port numbers in these tests: https://github.com/eclipse-zenoh/zenoh/blob/main/zenoh/tests/authentication.rs#L44-L91
Please respect the unicity of ports as it is, quic and tls do not close their ports in a consistent time, and the different tests run concurrently
Thanks 😄

[yellowhatter]

@yellowhatter could you please also update the port numbers in these tests: https://github.com/eclipse-zenoh/zenoh/blob/main/zenoh/tests/authentication.rs#L44-L81 Please respect the unicity of ports as it is, quic and tls do not close their ports in a consistent time, and the different tests run concurrently Thanks 😄

Yep, my text search wasn't good enough to find also these ports ;)

[yellowhatter]

@oteffahi done

[oteffahi]

LGTM.