chore: update dart template for 0.6.0 (#10462)

Co-authored-by: Andy Perelson <ajperel@users.noreply.github.com>

Author: brianquinlan

templates/init/functions/dart/pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: ^3.9.0
 
 dependencies:
-  firebase_functions: ^0.5.0
+  firebase_functions: ^0.6.0
 
 dev_dependencies:
   build_runner: ^2.4.0

templates/init/functions/dart/server.dart

@@ -1,7 +1,7 @@
 import 'package:firebase_functions/firebase_functions.dart';
 
-void main(List<String> args) {
-  fireUp(args, (firebase) {
+void main() {
+  runFunctions((firebase) {
     // https://firebase.google.com/docs/functions/http-events
     firebase.https.onRequest(
       name: 'helloWorld',