chore(deps-dev): bump the dev-dependencies group with 2 updates

Bumps the dev-dependencies group with 2 updates: [@google/genai](https://github.com/googleapis/js-genai) and [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node).


Updates `@google/genai` from 1.39.0 to 1.40.0
- [Release notes](https://github.com/googleapis/js-genai/releases)
- [Changelog](https://github.com/googleapis/js-genai/blob/main/CHANGELOG.md)
- [Commits](googleapis/js-genai@v1.39.0...v1.40.0)

Updates `@types/node` from 25.1.0 to 25.2.0
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@google/genai"
  dependency-version: 1.40.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
- dependency-name: "@types/node"
  dependency-version: 25.2.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dev-dependencies
...

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Author: dependabot[bot]