fix: Remove needless hacspec dependency in main lib

Author: chrysn

lib/Cargo.toml

@@ -10,7 +10,6 @@ description = "EDHOC implementation in Rust"
 hexlit = "0.5.3"
 hex = { version = "0.4.3", default-features = false }
 
-hacspec-lib = { version = "0.1.0-beta.1", default-features = false, optional = true }
 edhoc-crypto-trait = { path = "../crypto/edhoc-crypto-trait" }
 edhoc-consts = { path = "../consts" }
 edhoc-ead = { path = "../ead", default-features = false }