Bump the vitest group with 5 updates

Bumps the vitest group with 5 updates:

| Package | From | To |
| --- | --- | --- |
| [@vitest/browser](https://github.com/vitest-dev/vitest/tree/HEAD/packages/browser) | `4.0.14` | `4.0.16` |
| [@vitest/browser-playwright](https://github.com/vitest-dev/vitest/tree/HEAD/packages/browser-playwright) | `4.0.14` | `4.0.16` |
| [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul) | `4.0.14` | `4.0.16` |
| [@vitest/eslint-plugin](https://github.com/vitest-dev/eslint-plugin-vitest) | `1.5.1` | `1.6.4` |
| [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) | `4.0.14` | `4.0.16` |


Updates `@vitest/browser` from 4.0.14 to 4.0.16
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.16/packages/browser)

Updates `@vitest/browser-playwright` from 4.0.14 to 4.0.16
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.16/packages/browser-playwright)

Updates `@vitest/coverage-istanbul` from 4.0.14 to 4.0.16
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.16/packages/coverage-istanbul)

Updates `@vitest/eslint-plugin` from 1.5.1 to 1.6.4
- [Release notes](https://github.com/vitest-dev/eslint-plugin-vitest/releases)
- [Commits](vitest-dev/eslint-plugin-vitest@v1.5.1...v1.6.4)

Updates `vitest` from 4.0.14 to 4.0.16
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.16/packages/vitest)

---
updated-dependencies:
- dependency-name: "@vitest/browser"
  dependency-version: 4.0.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
- dependency-name: "@vitest/browser-playwright"
  dependency-version: 4.0.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
- dependency-name: "@vitest/coverage-istanbul"
  dependency-version: 4.0.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
- dependency-name: "@vitest/eslint-plugin"
  dependency-version: 1.6.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: vitest
- dependency-name: vitest
  dependency-version: 4.0.16
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: vitest
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -38,10 +38,10 @@
     "@hypothesis/frontend-testing": "^1.8.0",
     "@trivago/prettier-plugin-sort-imports": "^5.2.2",
     "@types/youtube": "^0.1.2",
-    "@vitest/browser": "^4.0.14",
-    "@vitest/browser-playwright": "^4.0.14",
-    "@vitest/coverage-istanbul": "^4.0.14",
-    "@vitest/eslint-plugin": "^1.5.1",
+    "@vitest/browser": "^4.0.18",
+    "@vitest/browser-playwright": "^4.0.18",
+    "@vitest/coverage-istanbul": "^4.0.18",
+    "@vitest/eslint-plugin": "^1.6.6",
     "babel-plugin-istanbul": "^7.0.0",
     "babel-plugin-mockable-imports": "^2.0.1",
     "chai": "^6.2.1",
@@ -58,7 +58,7 @@
     "sinon": "^19.0.2",
     "typescript": "^5.6.3",
     "typescript-eslint": "^8.53.1",
-    "vitest": "^4.0.14"
+    "vitest": "^4.0.18"
   },
   "prettier": {
     "arrowParens": "avoid",