[gradle] How can I force gradle to redownload dependencies?

You can do it like this

https://marschall.github.io/2017/04/17/disabling-gradle-cache.html

To quote from Disabling the Gradle Build Cache

The Gradle build cache may be a great thing when you’re regularly building >large projects with Gradle. However when only occasionally building open source >projects it can quickly become large.

To disable the Gradle build cache add the following line to ~/.gradle/gradle.properties

org.gradle.caching=false

You can clean the existing cache with

rm -rf $HOME/.gradle/caches/
rm -rf $HOME/.gradle/wrapper/