chore: bump up c8 version to v9 (#5505)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [c8](https://togithub.com/bcoe/c8) | [`^8.0.1` -> `^9.0.0`](https://renovatebot.com/diffs/npm/c8/8.0.1/9.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/c8/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/c8/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/c8/8.0.1/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/c8/8.0.1/9.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### 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](2cdc86bd0a))
-   **deps:** update foreground-child to promise API ([#&#8203;512](https://togithub.com/bcoe/c8/issues/512)) ([b46b640](b46b640127))
-   **deps:** use Node.js built in rm ([2cdc86b](2cdc86bd0a))

</details>

---

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yarn.lock

@@ -684,7 +684,7 @@ __metadata:
     "@types/supertest": "npm:^6.0.0"
     "@types/ws": "npm:^8.5.10"
     ava: "npm:^6.0.0"
-    c8: "npm:^8.0.1"
+    c8: "npm:^9.0.0"
     cookie-parser: "npm:^1.4.6"
     dotenv: "npm:^16.3.1"
     express: "npm:^4.18.2"
@@ -16757,25 +16757,24 @@ __metadata:
   languageName: node
   linkType: hard
 
-"c8@npm:^8.0.1":
-  version: 8.0.1
-  resolution: "c8@npm:8.0.1"
+"c8@npm:^9.0.0":
+  version: 9.0.0
+  resolution: "c8@npm:9.0.0"
   dependencies:
     "@bcoe/v8-coverage": "npm:^0.2.3"
     "@istanbuljs/schema": "npm:^0.1.3"
     find-up: "npm:^5.0.0"
-    foreground-child: "npm:^2.0.0"
+    foreground-child: "npm:^3.1.1"
     istanbul-lib-coverage: "npm:^3.2.0"
     istanbul-lib-report: "npm:^3.0.1"
     istanbul-reports: "npm:^3.1.6"
-    rimraf: "npm:^3.0.2"
     test-exclude: "npm:^6.0.0"
     v8-to-istanbul: "npm:^9.0.0"
     yargs: "npm:^17.7.2"
     yargs-parser: "npm:^21.1.1"
   bin:
     c8: bin/c8.js
-  checksum: 4d9d85fca952708d637e4d3c7961dc7245a09c60abb4c25d42393df4fd0d85e7352c1bb5c154e047c79d3bed7f2c5c1afd1ceaeff8c966a66336dbf31a629980
+  checksum: 71ccdf112ed5e52d983f20e0453e5abe1a61d2240cc5affe465933fe9a4d010ac9a3276a969a7bbfa705ae7395ea705384569549e242cf0ffdc9bb68401de699
   languageName: node
   linkType: hard
 
@@ -21223,7 +21222,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"foreground-child@npm:^3.1.0":
+"foreground-child@npm:^3.1.0, foreground-child@npm:^3.1.1":
   version: 3.1.1
   resolution: "foreground-child@npm:3.1.1"
   dependencies: