build(deps): bump mongo-java-driver from 3.12.1 to 3.12.8 (#2014)

Bumps [mongo-java-driver](https://github.com/mongodb/mongo-java-driver) from 3.12.1 to 3.12.8.
- [Release notes](https://github.com/mongodb/mongo-java-driver/releases)
- [Commits](https://github.com/mongodb/mongo-java-driver/compare/r3.12.1...r3.12.8)

---
updated-dependencies:
- dependency-name: org.mongodb:mongo-java-driver
  dependency-type: direct:production
...

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