* feat!: upgrade gradle to 6.1
* feat!: upgrade gradle build tools to 3.5.3
* feat: added `npm run clean-tests`
* fix!: Removed useDeprecatedNdk as this option is now completely removed from gradle.
* feat!: bump gradle to 6.1 & gradle build tools to 3.5.3
Co-authored-by: エリス <erisu@users.noreply.github.com>