Update dependency mongoose to v8.20.1 (#354)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [mongoose](https://mongoosejs.com)
([source](https://redirect.github.com/Automattic/mongoose)) | [`8.20.0`
-> `8.20.1`](https://renovatebot.com/diffs/npm/mongoose/8.20.0/8.20.1) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/mongoose/8.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/mongoose/8.20.0/8.20.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>Automattic/mongoose (mongoose)</summary>

###
[`v8.20.1`](https://redirect.github.com/Automattic/mongoose/blob/HEAD/CHANGELOG.md#8201--2025-11-20)

[Compare
Source](https://redirect.github.com/Automattic/mongoose/compare/8.20.0...8.20.1)

\===================

- types: correct Model.schema type and fix unknown check for this param
type in schema.methods
[#&#8203;15750](https://redirect.github.com/Automattic/mongoose/issues/15750)
[#&#8203;15693](https://redirect.github.com/Automattic/mongoose/issues/15693)
- docs: add detailed loadClass() TypeScript usage guide
[#&#8203;15731](https://redirect.github.com/Automattic/mongoose/issues/15731)
[#&#8203;12813](https://redirect.github.com/Automattic/mongoose/issues/12813)
[Necro-Rohan](https://redirect.github.com/Necro-Rohan)
- docs: update version support documentation for Mongoose
[#&#8203;15761](https://redirect.github.com/Automattic/mongoose/issues/15761)
[ManmathX](https://redirect.github.com/ManmathX)
- docs: add copy-to-clipboard feature for code blocks in docs
[#&#8203;15759](https://redirect.github.com/Automattic/mongoose/issues/15759)
[vedansha07](https://redirect.github.com/vedansha07)

</details>

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