chore: drop dependency override in example (#420)

...and fix other dependencies

Author: kevmoo

examples/protobuf_firestore/pubspec.yaml

@@ -5,17 +5,13 @@ environment:
   sdk: ^3.0.0
 
 dependencies:
-  functions_framework: ^0.4.0
+  functions_framework: ^0.4.3
   shelf: ^1.0.0
-  protobuf: any
+  protobuf: ^3.0.0
 
 dev_dependencies:
   build_runner: ^2.0.0
   functions_framework_builder: ^0.4.0
   http: '>=0.13.0 <2.0.0'
   test: ^1.15.0
   test_process: ^2.0.0
-
-dependency_overrides:
-  functions_framework:
-    path: ../../functions_framework

examples/protobuf_firestore/test/decode_test.dart

@@ -4,7 +4,7 @@ import 'package:test/test.dart';
 import 'test_shared.dart';
 
 void main() {
-  test('bob', () {
+  test('validate protobuf decode', () {
     final instance = DocumentEventData.fromBuffer(protobytes);
 
     expect(instance.toProto3Json(), jsonOutput);