chore(deps-dev): bump @vitest/coverage-v8 from 4.0.14 to 4.0.15 (#376)

Bumps [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) from 4.0.14 to 4.0.15.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.0.15/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.0.15
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

packages/toolbar/package.json

@@ -91,7 +91,7 @@
     "@vanilla-extract/css": "^1.17.4",
     "@vanilla-extract/vite-plugin": "^5.1.1",
     "@vanilla-extract/webpack-plugin": "^2.3.24",
-    "@vitest/coverage-v8": "4.0.14",
+    "@vitest/coverage-v8": "4.0.15",
     "css-loader": "^7.1.2",
     "jsdom": "^27.2.0",
     "launchdarkly-js-client-sdk": "^3.9.0",