maintainers: add irenes

maintainers/maintainer-list.nix

···
     githubId = 54999;
     name = "Ariel Nunez";
   };
+  irenes = {
+    name = "Irene Knapp";
+    email = "[e-mail]";
+    github = "IreneKnapp";
+    githubId = 157678;
+    keys = [{
+      longkeyid = "rsa4096/0xDBF252AFFB2619FD";
+      fingerprint = "E864 BDFA AB55 36FD C905  5195 DBF2 52AF FB26 19FD";
+    }];
+  };
   ironpinguin = {
     email = "[e-mail]";
     github = "ironpinguin";