maintainers: update usertam email and keys

Author: usertam

maintainers/maintainer-list.nix

@@ -24957,10 +24957,11 @@
     name = "Mason Mackaman";
   };
   usertam = {
-    email = "nix@usertam.dev";
+    name = "Samuel Tam";
+    email = "code@usertam.dev";
     github = "usertam";
     githubId = 22500027;
-    name = "Samuel Tam";
+    keys = [ { fingerprint = "EC4E E490 3C82 3698 2CAB  D206 2D87 60B0 229E 2560"; } ];
   };
   uskudnik = {
     email = "urban.skudnik@gmail.com";