This patch updates Crypto to the 2024 release version of CryptoKit.
As with prior years, there are small tweaks to the API surface that
cause this to manifest as a semver major. In this instance, the
relevant change is the removal of the long-deprecated setters for the
hash function block byte counts.

This is another change that meets the technical definition of a
semver major, but is practically extraordinarily unlikely to manifest
in an actual problem. Nonetheless, we do have to acknowledge the
reality that this can break compiling code (e.g. in cases where users
have defined protocols that rely on having a setter available, even
though they never call through it).

To that end, this pushes Crypto up to 4.0.