Bump mongodb/mongodb from 1.15.0 to 1.16.0

Bumps [mongodb/mongodb](https://github.com/mongodb/mongo-php-library) from 1.15.0 to 1.16.0.
- [Release notes](https://github.com/mongodb/mongo-php-library/releases)
- [Commits](mongodb/mongo-php-library@1.15.0...1.16.0)

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

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