Relax version constraint in net-ssh dependency

See merge request !3

ruby-net-ssh in unstable now is in version 7.0.0~beta1-1. AFAICS there
is no breakage in puppet-beaker because of this version bump, this new
version of ruby-net-ssh mostly contains openssl 3 related fixes.

it's required and it's no longer installed by ruby-beaker-hostgenerator
since version 1.7.1

Update to upstream version '4.30.0'
with Debian dir 507fe35ecb1ae9dbcd5e1a515cba2395058d426a

Update to upstream version '4.28.1'
with Debian dir 3502f50686733fb6bbaf7f4a9e059c1872825ad2

Relax version constraints of net-s{sh,cp}

See merge request !1

net-ssh 6.x compatibility was added by upstream with no further changes
here:

https://github.com/puppetlabs/beaker/commit/582e72b

and net-scp 3.x compatibility does not introduce any test regression,
proposed to upstream here:

https://github.com/puppetlabs/beaker/pull/1661

Update to upstream version '4.21.0'
with Debian dir bb969a663fa734e71bb071c75f88e70c5d3833f0

(MAINT) add changelog for 4.1.0 release

[skip ci]

(PUP-9212) Allow for alpine platform

(PUP-9136) Preserve host hash from beaker exec run

(BKR-1432) Test if puppet module is directly in source host root

The alpine platform is common for docker containers; allowing for it
gives beaker-docker the context necessary to sideload ssh onto the
container.