calls to visual_behavior.database only work with specific pymongo versions

[saakethmm]

Calls I made to visual_behavior.database only work on pymongo==3.12.3 or below (pymongo>=4.0 does not work)

*MongoClient.database_names() was removed in the migration to version 4, so the function list_database_names() must be used instead

As shown here:
https://pymongo.readthedocs.io/en/stable/migrate-to-pymongo4.html#mongoclient-database-names-is-removed

[alexpiet]

@yavorska-iryna encountered this problem as well. Down-grading to pymongo=3.10.1 resolved the problem