Update dependency mongoose to v8.16.4 (#297)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [mongoose](https://mongoosejs.com)
([source](https://redirect.github.com/Automattic/mongoose)) | [`8.16.3`
-> `8.16.4`](https://renovatebot.com/diffs/npm/mongoose/8.16.3/8.16.4) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/mongoose/8.16.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/mongoose/8.16.3/8.16.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

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

###
[`v8.16.4`](https://redirect.github.com/Automattic/mongoose/blob/HEAD/CHANGELOG.md#8164--2025-07-16)

[Compare
Source](https://redirect.github.com/Automattic/mongoose/compare/8.16.3...8.16.4)

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

- fix(connection): avoid calling connection.close() internally with
force: Object
[#&#8203;15534](https://redirect.github.com/Automattic/mongoose/issues/15534)
[#&#8203;15531](https://redirect.github.com/Automattic/mongoose/issues/15531)
- types(schema): handle required: string in schema definitions
[#&#8203;15538](https://redirect.github.com/Automattic/mongoose/issues/15538)
[#&#8203;15536](https://redirect.github.com/Automattic/mongoose/issues/15536)
- types(document): allow calling $isDefault() with no args
[#&#8203;15528](https://redirect.github.com/Automattic/mongoose/issues/15528)
[#&#8203;15522](https://redirect.github.com/Automattic/mongoose/issues/15522)
- types: infer Typescript string enums
[#&#8203;15530](https://redirect.github.com/Automattic/mongoose/issues/15530)
[ruiaraujo](https://redirect.github.com/ruiaraujo)
- types: pass TModelType down to schema statics
[#&#8203;15537](https://redirect.github.com/Automattic/mongoose/issues/15537)

</details>

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