Merge 3x into 4x

[justinstoller]

Conflicts:

• .github/workflows/rspec_tests.yml
• integration/tests/purging/invalid_allowlist_types.rb
• lib/r10k/version.rb

Updated to take 3.x acceptance test removals and 4.x rspec & version changes.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
4 out of 5 committers have signed the CLA.

:white_check_mark: bastelfreak
:white_check_mark: jonathannewman
:white_check_mark: donoghuc
:white_check_mark: nmburgan
:x: dependabot[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[justinstoller]

I don't think dependabot is going to sign the CLA : )