chrony: add gkleen as maintainer for nixos test for ptp_kvm

maintainers/maintainer-list.nix

···
     githubId = 60962839;
     name = "Mazen Zahr";
   };
+  gkleen = {
+    name = "Gregor Kleen";
+    email = "[e-mail]";
+    github = "gkleen";
+    githubId = 20089782;
+  };
   gleber = {
     email = "[e-mail]";
     github = "gleber";

nixos/tests/chrony-ptp.nix

···
 {
   name = "chrony-ptp";
 
+  meta = {
+    maintainers = with lib.maintainers; [ gkleen ];
+  };
+
   nodes = {
     qemuGuest = { lib, ... }: {
       boot.kernelModules = [ "ptp_kvm" ];