gitlab-shell buster-backports and golang 1.15

[Pirate Praveen <praveen@onenetbeyond.org>]

Hi go team,

Can someone try to build gitlab-shell buster-backports branch? it fails 
with
# gitlab.com/gitlab-org/gitlab-shell/client
src/gitlab.com/gitlab-org/gitlab-shell/client/gitlabnet.go:82:18: 
undefined: http.NewRequestWithContext

I tried building with newer golang-golang-x-net-dev as well as 
golang-any 1:1.14 but still fails with same error.

I suspect this could be related to version of golang, in 
unstable/testing it is 1.15 so we may need the newer golang version. 
Can someone confirm if this is indeed the case? If yes, do we plan to 
backport golang 1.15? I can also help with backporting.

Thanks
Praveen