fix(deps): update dependency natural to v6.12.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
natural	6.10.4 -> 6.12.0

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Release Notes

NaturalNode/natural (natural)

### [`v6.12.0`](https://togithub.com/NaturalNode/natural/releases/tag/v6.12.0): Storage backend integrated with classifiers [Compare Source](https://togithub.com/NaturalNode/natural/compare/v6.11.1...v6.12.0) ### [`v6.11.1`](https://togithub.com/NaturalNode/natural/releases/tag/v6.11.1): Expose expiration time as environment variable. [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.11.0...v6.11.1) ### [`v6.11.0`](https://togithub.com/NaturalNode/natural/releases/tag/v6.11.0): Add storage backend [Compare Source](https://togithub.com/NaturalNode/natural/compare/6.10.5...6.11.0) ### [`v6.10.5`](https://togithub.com/NaturalNode/natural/releases/tag/6.10.5) [Compare Source](https://togithub.com/NaturalNode/natural/compare/a37074e1178327d235174cbcab0ae53a4d8e807e...6.10.5) Repair loading of Bayesian classifiers.

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