Bump mongodb-memory-server in /examples/nestjs-mongoose-book-manager

Bumps [mongodb-memory-server](https://github.com/nodkz/mongodb-memory-server/tree/HEAD/packages/mongodb-memory-server) from 8.15.1 to 9.0.0.
- [Release notes](https://github.com/nodkz/mongodb-memory-server/releases)
- [Changelog](https://github.com/nodkz/mongodb-memory-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nodkz/mongodb-memory-server/commits/v9.0.0/packages/mongodb-memory-server)

---
updated-dependencies:
- dependency-name: mongodb-memory-server
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

examples/nestjs-mongoose-book-manager/package.json

@@ -49,7 +49,7 @@
     "eslint-plugin-no-only-or-skip-tests": "^2.6.2",
     "eslint-plugin-prettier": "^5.0.0",
     "jest": "29.5.0",
-    "mongodb-memory-server": "^8.15.1",
+    "mongodb-memory-server": "^9.0.0",
     "prettier": "^3.0.0",
     "source-map-support": "^0.5.20",
     "supertest": "^6.1.3",