Bug#1117550: No human maintainer for riseup-vpn now

Hello,

I will not be able to maintain riseup-vpn any further and have performed an upload
with my name dropped from the Uploaders field. Hence, anyone interested may join the
go packaging team and add themselves as uploaders for this package.

Some (Build-)Dependencies of riseup-vpn have also no uploader, so consider doing the
same for those package as well, if you want to maintain riseup-vpn.

Thanks,
Nilesh