Bump the unit-testing group across 1 directory with 6 updates

Bumps the unit-testing group with 6 updates in the /frontend-react directory:

| Package | From | To |
| --- | --- | --- |
| [@testing-library/react](https://github.com/testing-library/react-testing-library) | `16.1.0` | `16.2.0` |
| [@testing-library/user-event](https://github.com/testing-library/user-event) | `14.5.2` | `14.6.1` |
| [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul) | `2.1.8` | `3.0.4` |
| [@vitest/ui](https://github.com/vitest-dev/vitest/tree/HEAD/packages/ui) | `2.1.8` | `3.0.4` |
| [undici](https://github.com/nodejs/undici) | `6.21.0` | `6.21.1` |
| [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) | `2.1.8` | `3.0.4` |



Updates `@testing-library/react` from 16.1.0 to 16.2.0
- [Release notes](https://github.com/testing-library/react-testing-library/releases)
- [Changelog](https://github.com/testing-library/react-testing-library/blob/main/CHANGELOG.md)
- [Commits](testing-library/react-testing-library@v16.1.0...v16.2.0)

Updates `@testing-library/user-event` from 14.5.2 to 14.6.1
- [Release notes](https://github.com/testing-library/user-event/releases)
- [Changelog](https://github.com/testing-library/user-event/blob/main/CHANGELOG.md)
- [Commits](testing-library/user-event@v14.5.2...v14.6.1)

Updates `@vitest/coverage-istanbul` from 2.1.8 to 3.0.4
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.0.4/packages/coverage-istanbul)

Updates `@vitest/ui` from 2.1.8 to 3.0.4
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.0.4/packages/ui)

Updates `undici` from 6.21.0 to 6.21.1
- [Release notes](https://github.com/nodejs/undici/releases)
- [Commits](nodejs/undici@v6.21.0...v6.21.1)

Updates `vitest` from 2.1.8 to 3.0.4
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v3.0.4/packages/vitest)

---
updated-dependencies:
- dependency-name: "@testing-library/react"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: unit-testing
- dependency-name: "@testing-library/user-event"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: unit-testing
- dependency-name: "@vitest/coverage-istanbul"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: unit-testing
- dependency-name: "@vitest/ui"
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: unit-testing
- dependency-name: undici
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: unit-testing
- dependency-name: vitest
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: unit-testing
...

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

frontend-react/package.json

@@ -130,8 +130,8 @@
     "@storybook/theming": "^8.4.7",
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.6.3",
-    "@testing-library/react": "^16.1.0",
-    "@testing-library/user-event": "^14.5.2",
+    "@testing-library/react": "^16.2.0",
+    "@testing-library/user-event": "^14.6.1",
     "@types/dompurify": "^3.2.0",
     "@types/dotenv-flow": "^3.3.3",
     "@types/eslint__js": "^8.42.3",
@@ -146,8 +146,8 @@
     "@types/react-scroll-sync": "^0.9.0",
     "@types/sanitize-html": "^2.13.0",
     "@vitejs/plugin-react": "^4.3.4",
-    "@vitest/coverage-istanbul": "^2.1.8",
-    "@vitest/ui": "^2.1.8",
+    "@vitest/coverage-istanbul": "^3.0.4",
+    "@vitest/ui": "^3.0.4",
     "autoprefixer": "^10.4.20",
     "browserslist": "^4.24.4",
     "browserslist-useragent-regexp": "^4.1.3",
@@ -189,11 +189,11 @@
     "tslib": "^2.8.1",
     "typescript": "^5.7.3",
     "typescript-eslint": "^8.19.0",
-    "undici": "^6.20.1",
+    "undici": "^6.21.1",
     "vite": "^6.0.7",
     "vite-plugin-checker": "^0.8.0",
     "vite-plugin-svgr": "^4.3.0",
-    "vitest": "^2.1.8"
+    "vitest": "^3.0.4"
   },
   "resolutions": {
     "@types/react": "^18.3.11",