nixos/tests/hibernate: Fix netcat flags

I'm not sure why 024b501 used -q 0
because even netcat-openbsd has the -N flag which IMO is the better way
to shutdown the socket on EOF.

Our default netcat implementation has changed once again[1] in
3c3b822 and we're now using LibreSSL's
implementation, which doesn't have a -q flag.

See #39634 for the pull request
introducing the switch.

[1]: #19982

Signed-off-by: aszlig <aszlig@nix.build>
Cc: @matthewbauer, @dtzWill, @Mic92

nixos/tests/hibernate.nix

@@ -37,7 +37,7 @@ import ./make-test.nix (pkgs: {
       $machine->waitForShutdown;
       $machine->start;
       $probe->waitForUnit("network.target");
-      $probe->waitUntilSucceeds("echo test | nc machine 4444 -q 0");
+      $probe->waitUntilSucceeds("echo test | nc machine 4444 -N");
     '';
 
 })