build(deps-dev): bump vitest in /packages/whatsapp-mcp

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.9 to 4.1.5.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.5/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 4.1.5
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/whatsapp-mcp/package.json

@@ -82,7 +82,7 @@
     "tsup": "^8.5.1",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.59.2",
-    "vitest": "^2.1.9"
+    "vitest": "^4.1.5"
   },
   "dependencies": {
     "@dojocoding/whatsapp-sdk": "workspace:*"