Fix pipeline

We will want to get rid of the static mut altogether,
But that will be done when moving to Rust 2024. For now just fix the CI

src/tests.rs

@@ -1,4 +1,5 @@
 #![cfg(test)]
+#![allow(static_mut_refs)]
 use chacha20::ChaCha20;
 
 use crate::types::*;