为ApiGatewayV2 Target属性添加"DependsOn"语句，以保证其所依赖的资源已经被创建。

以下是一个示例CloudFormation模板，其中ApiGatewayV2 Target属性被设置为依赖于API Gateway的HTTP API资源：

Resources:
  MyHttpApi:
    Type: AWS::ApiGatewayV2::Api
    Properties:
      Name: my-http-api
 
  MyLambdaFunction:
    Type: AWS::Lambda::Function
    Properties:
      Code: ...
      Handler: ...
      Role: ...
 
  MyIntegration:
    Type: AWS::ApiGatewayV2::Integration
    Properties:
      ApiId: !Ref MyHttpApi
      IntegrationType: AWS_PROXY
      IntegrationUri: !Sub "arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${MyLambdaFunction}"
 
  MyRoute:
    Type: AWS::ApiGatewayV2::Route
    Properties:
      ApiId: !Ref MyHttpApi
      RouteKey: "GET /"
      Target: !Sub "integrations/${MyIntegration}"
      DependsOn:
        - MyIntegration
 
  MyTarget:
    Type: AWS::ApiGatewayV2::ApiGatewayManagedOverrides
    Properties:
      ApiId: !Ref MyHttpApi
      Integration: !Ref MyIntegration
      TargetManagedOverrides:
        Target: !Sub "arn:${AWS::Partition}:apigateway:${AWS::Region}:${AWS::AccountId}:/api/v2/httpapis/${MyHttpApi}/targets/${MyIntegration}"
      DependsOn:
        - MyIntegration