Update rclone to v1.3.9

[Christian Brüggemann]

Currently, rclone in entware is at v1.3.7, while the latest version is already v1.3.9, containing e.g. important performance improvements. See changelog.

Thanks in advance!

[Alexander Ryzhov]

https://github.com/Entware-ng/merge

Please, add new issue here if you still interested.

Sorry for inconvenience.