r10k: Require 4.x & octokit: Allow newer versions & puppetlabs_spec_helper: Require 7.x

[bastelfreak]

This is a requirement to get newer dependencies for modules testing. pdk configures puppet_litmus, which in turn depends on bolt, which depends on outdated other gems.

[bastelfreak]

@donoghuc why does bolt need to support Ruby 2.5? Why cant we drop it?

[donoghuc]

I think we can drop 2.5 for bolt 4.

[bastelfreak]

For bolt 4? Why can't we drop it now? Or do you mean for Bolt 3?

[donoghuc]

The only reason we've kept 2.5 is for some internal testing on older OS. I was thinking of updating all that when we move to making the default ruby 3 based (keeping ruby 2.7 compatability for 2021.7 PE stream). What is the min version being 2.5 preventing for you now?