sonic-server: add anthonyroussel to maintainers

pkgs/servers/search/sonic-server/default.nix

···
     license = licenses.mpl20;
     platforms = platforms.unix;
     mainProgram = "sonic";
-    maintainers = with maintainers; [ pleshevskiy ];
+    maintainers = with maintainers; [ pleshevskiy anthonyroussel ];
   };
 }