chore(deps): update dependency c8 to v9

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [c8](https://togithub.com/bcoe/c8) | [`^8.0.0` ->
`^9.0.0`](https://renovatebot.com/diffs/npm/c8/8.0.0/9.0.0) |
[![age](https://developer.mend.io/api/mc/badges/age/npm/c8/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/c8/8.0.0/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

---

### Release Notes

<details>
<summary>bcoe/c8 (c8)</summary>

###
[`v9.0.0`](https://togithub.com/bcoe/c8/blob/HEAD/CHANGELOG.md#900-2024-01-03)

[Compare Source](https://togithub.com/bcoe/c8/compare/v8.0.1...v9.0.0)

##### ⚠ BREAKING CHANGES

-   **build:** minimum Node.js version is now 14.14.0

##### Features

- **build:** minimum Node.js version is now 14.14.0
([2cdc86b](https://togithub.com/bcoe/c8/commit/2cdc86bd0ac67ecf0f700212dc5f8a830ff9164f))
- **deps:** update foreground-child to promise API
([#&#8203;512](https://togithub.com/bcoe/c8/issues/512))
([b46b640](https://togithub.com/bcoe/c8/commit/b46b6401274488db5b1027a78090257095ae4f72))
- **deps:** use Node.js built in rm
([2cdc86b](https://togithub.com/bcoe/c8/commit/2cdc86bd0ac67ecf0f700212dc5f8a830ff9164f))

###
[`v8.0.1`](https://togithub.com/bcoe/c8/blob/HEAD/CHANGELOG.md#801-2023-07-25)

[Compare Source](https://togithub.com/bcoe/c8/compare/v8.0.0...v8.0.1)

##### Bug Fixes

- **deps:** update istanbul deps
([#&#8203;485](https://togithub.com/bcoe/c8/issues/485))
([3be8bd9](https://togithub.com/bcoe/c8/commit/3be8bd97c3fb38b575a48871c170dd5e5041b9a8)),
closes [#&#8203;478](https://togithub.com/bcoe/c8/issues/478)

</details>

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