chore(deps-dev): bump mongodb in /packages/opentelemetry-node

Bumps [mongodb](https://github.com/mongodb/node-mongodb-native) from 6.11.0 to 6.12.0.
- [Release notes](https://github.com/mongodb/node-mongodb-native/releases)
- [Changelog](https://github.com/mongodb/node-mongodb-native/blob/main/HISTORY.md)
- [Commits](mongodb/node-mongodb-native@v6.11.0...v6.12.0)

---
updated-dependencies:
- dependency-name: mongodb
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>