build(deps-dev): bump de.flapdoodle.embed:de.flapdoodle.embed.mongo (#3248)

Bumps [de.flapdoodle.embed:de.flapdoodle.embed.mongo](https://github.com/flapdoodle-oss/de.flapdoodle.embed.mongo) from 4.18.1 to 4.20.0.
- [Commits](https://github.com/flapdoodle-oss/de.flapdoodle.embed.mongo/compare/de.flapdoodle.embed.mongo-4.18.1...de.flapdoodle.embed.mongo-4.20.0)

---
updated-dependencies:
- dependency-name: de.flapdoodle.embed:de.flapdoodle.embed.mongo
  dependency-version: 4.20.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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