Update zlint to get close-primes lint, remove our own

[aarongable]

zlint now has a close-primes checker: https://github.com/zmap/zlint/pull/674

we should update our dependency on zlint to a version that contains this new lint, and then consider removing our own one-off check: https://github.com/letsencrypt/boulder/blob/89000bd61cfc6f373cb48b6f046d4fce7df5468e/goodkey/good_key.go#L388