The fundamental work for this ticket was finished in RUBY-3232. However, Mongoid itself still needs to have its evergreen matrices updated to use the newer build hosts.

From the original ticket:

DRIVERS-2592:
The build team is winding down support for OSes that are either unsupported or in extended security maintenance (ESM) as part of PM-3193. This includes Ubuntu 18.04, which is in ESM in Apr 2023, and any of the RHEL 7.x build variants less than 7.6. RHEL 7.6 enters ESM in Jun 2024.

Drivers should begin to migrate away from unsupported platforms. Note that MongoDB 3.6 is supported on RHEL 7.x and 8.x: https://www.mongodb.com/docs/v3.6/tutorial/install-mongodb-enterprise-on-red-hat/#platform-support.

Drivers should migrate to RHEL if possible