deps(npm): bump @vitest/coverage-v8 in /frontend/taskdeck-web

Bumps [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) from 2.1.9 to 4.1.2.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.2/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-version: 4.1.2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/taskdeck-web/package-lock.json

@@ -46,7 +46,7 @@
     "@typescript-eslint/eslint-plugin": "^8.46.2",
     "@typescript-eslint/parser": "^8.46.2",
     "@vitejs/plugin-vue": "^6.0.1",
-    "@vitest/coverage-v8": "^2.1.8",
+    "@vitest/coverage-v8": "^4.1.2",
     "@vitest/ui": "^2.1.8",
     "@vue/test-utils": "^2.4.6",
     "@vue/tsconfig": "^0.8.1",