Upgraded MongoDB driver dependency to mongodb-driver-legacy 4.11.3

[jyemin]

• Use mongodb-driver-legacy since mongo-java-driver uber jar is not published as of 4.0.
• Replace find modifiers, which were removed in 4.0, with calls to FindIterable methods
• Remove support for $maxScan, which is no longer supported by MongoDB
• Remove support for $explain. The only way to explain with the 4.x driver is by calling FindIterable#explain. We could do that, and then use SingleTupleIterator, but is it worth it? Is explain only supported by OGM as a native query?
• Handle breaking changes in WriteConcern class
• Handle breaking changes related to MongoCredential

One big issue is that I can't get the tests to all pass even on the main branch, so I can't tell if all these changes are correct. I'm also unsure how to test against, say, MongoDB 7.0.

[Sanne]

Thanks! Looks very reasonable - but it seems CI jobs are no longer being triggered; I'll need to ask my team mates about it.

[jyemin]

it seems CI jobs are no longer being triggered; I'll need to ask my team mates about it.

@Sanne , maybe because this PR is against our fork? Happy to open it against https://github.com/hibernate/hibernate-ogm instead. I was holding off because I wanted it go through some review first from MongoDB driver engineers.

[Sanne]

@jyemin ah right I hadn't realized!
yes please, don't worry and feel free to send any PRs to the reference fork.

[jyemin]

Done: hibernate#1127