Update Motor compatibility matrix

Description

The Motor matrix is out of date. Please add Motor 2.2 and 2.3, which both support MongoDB 4.4.

Every Motor release supports server versions back to MongoDB 3.0.

A/C

 As a user, I should be able to see entries for MongoDB 4.4 compatibility in the Motor compatibility matrix.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)