Let the kakfa cli plugin use the default retention time

[PaulyFleming]

This makes a change so that the kafka default retention time on a new topic is handled by the default_retention_time and not the minimum_retention_time.

This PR pairs up with this PR that changes the minimum allowed retention time on Kafka topics to 6 hours (from 24) while keeping the default retention time for new topics at 24 hours.

• Devcenter docs also need updating to reflect this change: https://devcenter.heroku.com/articles/kafka-on-heroku#time-based-retention

Change Proposal: https://salesforce.quip.com/7fCdA7EZb7Gg

• Updated this PR with security vulns from this PR: fix(W-18063165): update heroku-kafka dependencies to address security vulns #232
• Re ran tests and all is working

heroku kafka:topics:create topic-moose HEROKU_KAFKA_PFLEMING_PUCE -a pfleming-kafka-us
Creating topic topic-moose with compaction disabled and retention time 1 day on kafka-pfleming-silhouetted-42102... done
Use `heroku kafka:topics:info topic-moose` to monitor your topic.

heroku kafka:topics:retention-time topic-moose '6 hours' HEROKU_KAFKA_PFLEMING_PUCE -a pfleming-kafka-us 
Setting retention time to 6 hours for topic topic-moose on kafka-pfleming-silhouetted-42102... done
Use `heroku kafka:topics:info topic-moose` to monitor your topic.

heroku kafka:topics:retention-time topic-moose '8 hours' HEROKU_KAFKA_PFLEMING_PUCE -a pfleming-kafka-us 
Setting retention time to 8 hours for topic topic-moose on kafka-pfleming-silhouetted-42102... done
Use `heroku kafka:topics:info topic-moose` to monitor your topic.

[sbosio]

Review the comment I left, there seems to be a typo on the changed line. But overall looks ok, so I'm approving.

[PaulyFleming]

Thank you @sbosio & good catch on the double assignment typo!

[justinwilaby]

LGTM