all: make the package a wrapper around crypto/mlkem

Author: FiloSottile

README.md

@@ -20,4 +20,5 @@ document.
 Reviewers unfamiliar with polynomials or linear algebra might find the
 background at https://words.filippo.io/kyber-math/ useful.
 
-This code is aimed at being upstreamed in the standard library.
+This code was upstreamed in the standard library in Go 1.24, and is now
+just a wrapper around the standard library's `crypto/mlkem` package.

go.mod

@@ -1,7 +1,3 @@
 module filippo.io/mlkem768
 
-go 1.21.3
-
-require golang.org/x/crypto v0.26.0
-
-require golang.org/x/sys v0.24.0 // indirect
+go 1.24.0