Upgrade ruby base image

[gl-johnson]

Desired Outcome

Fix buidling of the PDK image, and upgrade the Dockerfile base image to 3.3-rc-slim

Includes changes from #257

NOTE: Due to recurring issues with provisioning Windows nodes in CI we are skipping the integration tests for now, but it is highly unlikely that these changes will have impacted the modules functionality.

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
• 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
• 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]
• 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
• 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
• There are no security aspects to these changes

[juniortaeza]

LGTM!

Ruby upgrade with corresponding syntax changes and temporary disabling of the Windows Node executors all look good.

This should also close out my upgrade branch/ticket from a while back so I'll mark my ticket for that as 'Done'.

Thank you!