Make blake2s API internal (#2265)

* Make blake2s function internal

* Update CHANGELOG

* Make blake2s modules internal instead

Author: gabrielbosio

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 #### Upcoming Changes
 
+* dev(BREAKING): Make blake2s API internal [#2265](https://github.com/lambdaclass/cairo-vm/pull/2265)
+
 * bugfix: Fix temp segment chain bug [#2195](https://github.com/lambdaclass/cairo-vm/pull/2195)
 
 #### [3.0.0-rc.4] - 2025-28-10

vm/src/hint_processor/builtin_hint_processor/mod.rs

@@ -1,6 +1,6 @@
 pub mod bigint;
-pub mod blake2s_hash;
-pub mod blake2s_utils;
+pub(crate) mod blake2s_hash;
+mod blake2s_utils;
 pub mod builtin_hint_processor_definition;
 pub mod cairo_keccak;
 pub mod dict_hint_utils;