Release prep v4.20.0

[github-actions[bot]]

Automated release-prep through pdk-templates from commit a23343b0507304cb2c331ba238d51aea43868364. Please verify before merging:

• [x] last nightly run is green
• [x] Changelog is readable and has no unlabeled pull requests
• [x] Ensure the changelog version and metadata version match

NOTE: nightly is generated from pdk-templates and the cat-github-actions. So it must be manually verified for now

[bastelfreak]

@joshcooper can you take a look at this one? I need https://github.com/puppetlabs/puppetlabs-puppet_agent/pull/714 as a bugfix for a customer

[joshcooper]

closing and reopening to retrigger checks

[joshcooper]

Oh nice, @h0tw1r3 fixed bcrypt_pbkdf2 compilation on windows! https://github.com/net-ssh/bcrypt_pbkdf-ruby/pull/22