openssh: add numinit as maintainer

I've found issues in other distros' deployments of SSH daemons before
(e.g. CVE-2025-30095) -- happy to help make sure NixOS' is properly
maintained. If there's something wrong with OpenSSH, I'd like to
help triage and support whatever remediations I need to.

Discussed with Philip already to confirm over Discourse, prior to making
this commit the first time. :-)

pkgs/tools/networking/openssh/default.nix

@@ -33,7 +33,12 @@ in
     };
 
     extraPatches = [ ./ssh-keysign-8.5.patch ];
-    extraMeta.maintainers = lib.teams.helsinki-systems.members ++ [ lib.maintainers.philiptaron ];
+    extraMeta.maintainers =
+      lib.teams.helsinki-systems.members
+      ++ (with lib.maintainers; [
+        numinit
+        philiptaron
+      ]);
   };
 
   openssh_hpn = common rec {