I see that my current Infura node is using Geth v1.9.9.
There are active discussions taking place about the fact that Geth v1.9.12 acts behaviorally differently than prior versions. If Infura were to upgrade their Geth version, it is unclear what (if anything) in our stack would break.
How often does Infura update their client versions, and how much warning is given to Infura users?