I will do my best to help you, because I see that you haven't received any help yet. Hope to be of help.

The first thing I would say is to check if you have to make changes to your code (link: way to connect to mongoDB in the current version) as you have updated the driver version (sometimes local tests are not good enough to fully test your code and maybe you have left out something important). Here you have a link in case something is deprecated. For example, I see the following in the exception you have passed com.mongodb.MongoClient which is now com.mongodb.client.MongoClient. So it looks your code is still compatible with 3.X version instead of the 5.X version.

Note: With the command mvn dependency:tree (link) you can see the dependency tree for your project and ensure if any library is bringing in any older version.