fix(v3): Compatible with css-loader@3.4.2

packages/vue-cli-plugin-uni/lib/env.js

@@ -336,6 +336,7 @@ moduleAlias.addAlias('mpvue-template-compiler', '@dcloudio/vue-cli-plugin-uni/pa
 moduleAlias.addAlias('vue-loader', '@dcloudio/vue-cli-plugin-uni/packages/vue-loader')
 
 if (process.env.UNI_USING_V3 && process.env.UNI_PLATFORM === 'app-plus') {
+  moduleAlias.addAlias('./runtime/getUrl.js', '@dcloudio/vue-cli-plugin-uni/lib/app-plus/getUrl.js')
   moduleAlias.addAlias('../runtime/getUrl.js', '@dcloudio/vue-cli-plugin-uni/lib/app-plus/getUrl.js')
   moduleAlias.addAlias('vue-style-loader', '@dcloudio/vue-cli-plugin-uni/packages/app-vue-style-loader')
 }