Update puma to version 6

[mFelgate]

Desired Outcome

Update dependencies in the gemfile to prepare for th eFips upgrade

Implemented Changes

Describe how the desired outcome above has been achieved with this PR. In
particular, consider:

• What's changed? Why were these changes made?
• updated the gemfiles, notice files, and some tests that required a syntax change

Connected Issue/Story

Resolves #[relevant GitHub issue(s), e.g. 76]

CyberArk internal issue ID: CNJR-2564

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

[micahlee]

Hey @mFelgate, could you also please update the Changelog to include the puma change, since it specifically address a CVE. See the UI repo for an example:
https://github.cyberng.com/Conjur-Enterprise/conjur-ui/blob/master/CHANGELOG.md#security

Since this does require an additional push, would you also please move the NOTICES.txt updates for puma to the same commit where we bump puma as well?

The rest looks good, thanks!

Thanks!

[codeclimate]

Code Climate has analyzed commit cab6fff and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 88.3% (-0.2% change).

View more on Code Climate.

[micahlee]

LGTM, thanks @mFelgate!