chore: release v2.1.1

[github-actions[bot]]

🤖 New release

• kiddo: 2.1.0 -> 2.1.1 (✓ API compatible changes)

Changelog

## [2.1.1](https://github.com/sdd/kiddo/compare/v2.1.0...v2.1.1) - 2023-06-07 ### Fixed - *(deps)* update rust crate serde_with to v3 ### Other - fix pre-release - fix pre-release.yml - fix pre-release - fix pre-release - fix pre-release.yml - fix pre-release - add pre-release - add coverage checking - fix clippy lints - update CI workflow - update rkyv-large example - minor documentation enhancements - fix serde example - *(deps)* update rust crate criterion to 0.5 - Add `FromIterator` and `Extend` impls - add some missing docs and hide some private internals - fix nearest_n bench code - float and fixed both use a common macro for best_n_within - float and fixed both use a common macro for within_unsorted - float and fixed both use a common macro for within - float and fixed both use a common macro for nearest_n - update `Axis` trait to include some methods so that the

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