Update Checkov and CFN-Lint

[g-marconet]

Update Checkov and CFN-Lint

Description

• Updates Checkov to 3.2.268
  • Packaging gets bumped to 23.2, which is what Checkov requires
• CFN-Lint gets bumped to 1.18.1
  • The latest version removes a conflict with Checkov on jsonschema versions
• Also removes some things we were doing to accommodate the old Checkov version, like pinning setuptools and virtualenv versions in the Github Actions Workflows

Motivation and Context

• Checkov likes to pin dependencies, which made the old version kinda problematic as its dependencies were conflicting with other things.
• CFN-Lint needed to be updated in order to update Checkov

How Has This Been Tested?

• Tests pass
• Working in dev environment

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation change

Checklist

• My code follows conforms to the coding standards.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[ZoogieZork]

For a follow-up PR, we should be able to un-comment the "New findings in Checkov 3.2." block. Unless something changed since the last time we tried to upgrade Checkov, those extra two test cases should still be valid. :)