Fix occasional port conflict in CLI integration test

[youngjoon-lee]

The dessemination CLI integration test sometimes fails with the following error.
https://github.com/logos-co/nomos-node/actions/runs/6730826847/job/18294274937

thread 'Overwatch' panicked at nomos-services/network/src/backends/libp2p/swarm.rs:54:49:
called `Result::unwrap()` on an `Err` value: Other(Custom { kind: Other, error: Transport(Custom { kind: Other, error: Other(Left(Left(Os { code: 98, kind: AddrInUse, message: "Address already in use" }))) }) })

It's because the test kills one of the running nomos-nodes (using SIGKILL) and reuses its network_config to run the CLI. But, it seems that the libp2p port is sometimes not closed immediately by OS.

Instead, I changed it to use a new port for CLI.