Remove unnecessary derivative dependency

Cargo.lock

@@ -3476,7 +3476,6 @@ dependencies = [
  "config",
  "conquer-once",
  "curve25519-dalek",
- "derivative",
  "dialoguer",
  "directories-next",
  "ecdsa_fun",

swap/Cargo.toml

@@ -24,7 +24,6 @@ bitcoin-harness = { git = "https://github.com/coblox/bitcoin-harness-rs" }
 config = { version = "0.10", default-features = false, features = ["toml"] }
 conquer-once = "0.3"
 curve25519-dalek = "3"
-derivative = "2"
 dialoguer = "0.7"
 directories-next = "2"
 ecdsa_fun = { git = "https://github.com/LLFourn/secp256kfun", features = ["libsecp_compat", "serde"] }