keyv - upgrading keyv to v5.0.2 and on() as a void return

[jaredwray]

Please check if the PR fulfills these requirements

• [x] Followed the Contributing guidelines.
• [x] Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• [ ] Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) keyv - upgrading keyv to v5.0.2 and on() as a void return

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (53c4aea) to head (998c032). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1136 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 15 15 Lines 67 67 ========================================= Hits 67 67 ``` | [Flag](https://app.codecov.io/gh/jaredwray/keyv/pull/1136/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/jaredwray/keyv/pull/1136/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray) | `100.00% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jared+Wray#carryforward-flags-in-the-pull-request-comment) to find out more.

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