maintainers: update griffi-gh (#434385)

maintainers/maintainer-list.nix

···
     name = "Eric Seidel";
   };
   griffi-gh = {
-    name = "Alex Prasol";
+    name = "Luna Prasol";
     email = "[e-mail]";
     matrix = "@voxel:nyanbinary.rs";
     github = "griffi-gh";