agda: add fuuzetsu to maintainers

pkgs/development/compilers/agda/default.nix

···
     description = "A dependently typed functional programming language and proof assistant";
     license = self.stdenv.lib.licenses.mit;
     platforms = self.ghc.meta.platforms;
+    maintainers = with self.stdenv.lib.maintainers; [ fuuzetsu ];
   };
 })

pkgs/development/compilers/agda/stdlib.nix

···
     description = "A standard library for use with the Agda compiler.";
     license = stdenv.lib.licenses.mit;
     platforms = stdenv.lib.platforms.unix;
-    maintainers = with maintainers; [ jwiegley ];
+    maintainers = with maintainers; [ jwiegley fuuzetsu ];
   };
 })