DRIVERS-2781 : Summary of necessary driver changes Expose the cache expiration option provided by libmongocrypt Commits for syncing spec/prose tests C driver implementation: https://github.com/mongodb/mongo-c-driver/commit/b0edf300b8623bc8a4d861f02aaefc8c312c46c9 libmongocrypt implementation is available in 1.12.0: https://github.com/mongodb/libmongocrypt/commit/11a8060526a638575d5e18cad254256ac871078c Spec tests: Added in: https://github.com/mongodb/specifications/commit/ecce2eccf0e6f3b41dff3bf0e57e2350f7517340   Updated (to increase wait time) in: https://github.com/mongodb/specifications/commit/787bbe67bdffb614270654372112e93fc2cd3eb3