6.1.1 升级 6.1.3 报错 Declaration of think\app\Url::build() must be compatible with think\route\Url::build(): string

[yaody123]

6.1.1 升级到6.1.3 报错， 官方不修复以下吗？

#0 [64]ErrorException in Url.php line 71
D:\WWW\app\vendor\topthink\think-multi-app\src\Url.php
Declaration of think\app\Url::build() must be compatible with think\route\Url::build(): string