Update and remove unused dependencies

Cargo.lock

@@ -1696,11 +1696,9 @@ dependencies = [
  "dleq",
  "flexible-transcript",
  "group",
- "hex",
  "multiexp",
  "rand_core 0.6.4",
  "schnorr-signatures",
- "subtle",
  "thiserror",
  "zeroize",
 ]
@@ -3081,15 +3079,6 @@ version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ebdb29d2ea9ed0083cd8cece49bbd968021bd99b0849edb4a9a7ee0fdf6a4e0"
 
-[[package]]
-name = "hkdf"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
-dependencies = [
- "hmac 0.12.1",
-]
-
 [[package]]
 name = "hmac"
 version = "0.8.1"
@@ -4610,7 +4599,6 @@ version = "0.1.2"
 dependencies = [
  "crypto-bigint",
  "dalek-ff-group",
- "digest 0.10.6",
  "ff",
  "ff-group-tests",
  "generic-array 0.14.6",
@@ -4680,7 +4668,6 @@ dependencies = [
 name = "modular-frost"
 version = "0.5.0"
 dependencies = [
- "chacha20 0.9.0",
  "ciphersuite",
  "dalek-ff-group",
  "digest 0.10.6",
@@ -4689,7 +4676,6 @@ dependencies = [
  "flexible-transcript",
  "group",
  "hex",
- "hkdf",
  "minimal-ed448",
  "multiexp",
  "rand_chacha 0.3.1",