在我的build.gradle当中implementation 'com.tencent.mm.opensdk:wechat-sdk-android:+'

之前用的好好的，突然在build项目的时候一直提示：

Could not determine the dependencies of task ':app:processApp_completeDebugResources'.

> Could not resolve all task dependencies for configuration ':app:app_completeDebugRuntimeClasspath'.

   > Could not resolve com.tencent.mm.opensdk:wechat-sdk-android:+.

     Required by:

         project :app

      > Could not resolve com.tencent.mm.opensdk:wechat-sdk-android:6.8.30-SNAPSHOT.

         > Unable to load Maven meta-data from https://oss.sonatype.org/content/repositories/snapshots/com/tencent/mm/opensdk/wechat-sdk-android/6.8.30-SNAPSHOT/maven-metadata.xml.

            > Could not get resource 'https://oss.sonatype.org/content/repositories/snapshots/com/tencent/mm/opensdk/wechat-sdk-android/6.8.30-SNAPSHOT/maven-metadata.xml'.

               > Could not GET 'https://oss.sonatype.org/content/repositories/snapshots/com/tencent/mm/opensdk/wechat-sdk-android/6.8.30-SNAPSHOT/maven-metadata.xml'. Received status code 504 from server: Gateway Time-out