build(deps-dev): bump the vitest group across 2 directories with 2 updates

Bumps the vitest group with 1 update in the / directory: [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8).
Bumps the vitest group with 1 update in the /build/frontend-legacy directory: [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8).


Updates `@vitest/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)

Updates `vitest` 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/vitest)

Updates `@vitest/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)

Updates `vitest` 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/vitest)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -113,7 +113,7 @@
     "@testing-library/user-event": "^14.6.1",
     "@testing-library/vue": "^5.8.3",
     "@vitejs/plugin-vue2": "^2.3.4",
-    "@vitest/coverage-v8": "^4.0.14",
+    "@vitest/coverage-v8": "^4.0.15",
     "@vue/test-utils": "^1.3.5",
     "@vue/tsconfig": "~0.5.1",
     "babel-loader-exclude-node-modules-except": "^1.2.1",