This ticket was split from DRIVERS-3451, please see that ticket for a detailed description.

Definition of Done

• Update the MinWireVersion from 8 to 9 in internal/driverutil/description.go
• Remove the wireVersion42 = 8 constant in x/mongo/driver/topology/server.go and simplify the two pool-clear branches.
• Remove cryptMinWireVersion constant in x/mongo/driver/operation.go: this const is not necessary with a floor of 9. Remove the guard for this constant: desc.WireVersion.Max < cryptMinWireVersion.
• In .evergreen/config.yml we need to
  • remove the 4.2 version axis entry so that no build variant provisions a 4.2 server
  • Drop 4.2 from the rhel matrix
  • Drop 4.2 form the windows matrix
• Update README.md to include that the minimum supported version is 4.4.
• The release notes for 2.9.0 should state “minimum supported MongoDB server version is now 4.4.” as important. 
  • Create a new ticket for the 2.9.0 release that has this requirement