[BUG] update() raises a RevisionIdWasChanged when expecting a DuplicateKeyError

[NiziL]

Describe the bug

When creating a Document with an unique indexed attribute, violating the uniqueness raise a RevisionIdWasChanged instead of a DuplicateKeyError.

To Reproduce

import asyncio
from typing import Annotated

import pymongo
from beanie import Document, Indexed, init_beanie
from motor.motor_asyncio import AsyncIOMotorClient


client = AsyncIOMotorClient("mongodb://localhost:27017/test")


class MyDocument(Document):
    unique: Annotated[str, Indexed(index_type=pymongo.TEXT, unique=True)]


async def test():
    await init_beanie(client.get_default_database(), document_models=[MyDocument])
    doc = MyDocument(unique="test")
    await doc.save()
    doc2 = MyDocument(unique="test")
    await doc2.save()


if __name__ == "__main__":
    asyncio.run(test())

Expected behavior
Raise the DuplicateKeyError instead of replacing it by a RevisionIdWasChanged.

Additional context
The bug comes from documents.py, line 739/740.

I feel like we could easily catch the error, ensure the DuplicateKeyError comes from a revision id issue, and either raise a RevisionIdWasChanged or this error.
Something like:

except DuplicateKeyError as e:
    raise RevisionIdWasChanged if "revision_id" in e._message else e 

I can prepare a PR for this, I just feel like my solution is a bit hacky right now... Any ideas ?