MongoDb API: Create Snapshot cannot handle `expires_at` without timezone information

[YYYasin19]

    snapshot = api.create_snapshot(
        instance_id=instance_id,
        name=f"backup-{datetime.now().strftime('%Y-%m-%d')}",
        expires_at=datetime.now() + timedelta(days=expiry_days),
    )

causes

scaleway_core.api.ScalewayException: {"message":"proto: (line 1:45): invalid google.protobuf.Timestamp value \"2025-07-15T19:10:02.351424\""}

while

    snapshot = api.create_snapshot(
        instance_id=instance_id,
        name=f"backup-{datetime.now().strftime('%Y-%m-%d')}",
        expires_at=datetime.now(tz=timezone.utc) + timedelta(days=expiry_days),
    )

works.

This should be documented and/or a default timezone (e.g. UTC) should be assumed