Bump @vitest/mocker and vitest in /tools/web

Bumps [@vitest/mocker](https://github.com/vitest-dev/vitest/tree/HEAD/packages/mocker) to 4.1.12 and updates ancestor dependency [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest). These dependencies need to be updated together.

Updates `@vitest/mocker` from 4.1.11 to 4.1.12
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Changelog](https://github.com/vitest-dev/vitest/blob/main/docs/releases.md)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.12/packages/mocker)

Updates `vitest` from 4.1.11 to 4.1.12
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Changelog](https://github.com/vitest-dev/vitest/blob/main/docs/releases.md)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.12/packages/vitest)

---
updated-dependencies:
- dependency-name: "@vitest/mocker"
  dependency-version: 4.1.12
  dependency-type: indirect
- dependency-name: vitest
  dependency-version: 4.1.12
  dependency-type: direct:development
...

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

Author: dependabot[bot]

tools/web/package-lock.json

@@ -53,7 +53,7 @@
     "typescript": "5.9.3",
     "typescript-eslint": "8.65.0",
     "vite": "8.3.5",
-    "vitest": "4.1.11"
+    "vitest": "4.1.12"
   },
   "overrides": {
     "next": {