Fix bug in PDK validate/test

[gl-johnson]

Desired Outcome

The version of puppet included with PDK (6.27.0) is broken due to a change in concurrent-ruby. It appears to be fixed in Puppet 6.29.0, so update the dockerfile to fetch a newer version of PDK

See: https://github.com/ruby-concurrency/concurrent-ruby/pull/988 Fixed by: https://github.com/puppetlabs/puppet/pull/8996

Also address dev tasks around updating Docker base images and upgrading to Ruby 3.

Implemented Changes

• Run pdk validate and test against a more recent version of Puppet with the fix
• Update docker base images
• Fix Windows docker builds by disabling buildkit

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be merged.

Changelog

• [ ] The CHANGELOG has been updated, or
• [x] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

• [ ] This PR includes new unit and integration tests to go with the code changes, or
• [x] The changes in this PR do not require tests

Documentation

• [ ] Docs (e.g. READMEs) were updated in this PR
• [ ] A follow-up issue to update official docs has been filed here: [insert issue ID]
• [x] This PR does not require updating any documentation

Behavior

• [ ] This PR changes product behavior and has been reviewed by a PO, or
• [ ] These changes are part of a larger initiative that will be reviewed later, or
• [x] No behavior was changed with this PR

Security

• [ ] Security architect has reviewed the changes in this PR,
• [ ] These changes are part of a larger initiative with a separate security review, or
• [x] There are no security aspects to these changes