Clean up imports in lightning-types

To remove the now-redundant `hex_conservative` explicit dependency.

Author: TheBlueMatt

lightning-types/Cargo.toml

@@ -17,8 +17,6 @@ _test_utils = []
 
 [dependencies]
 bitcoin = { version = "0.32.2", default-features = false }
-# TODO: Once we switch to bitcoin 0.32 drop this explicit dep:
-hex-conservative = { version = "0.2", default-features = false }
 bech32 = { version = "0.9", default-features = false }
 
 [lints]

lightning-types/src/payment.rs

@@ -14,9 +14,7 @@ use alloc::vec::Vec;
 use core::borrow::Borrow;
 
 use bitcoin::hashes::{sha256::Hash as Sha256, Hash as _};
-
-// TODO: Once we switch to rust-bitcoin 0.32, import this as bitcoin::hex
-use hex_conservative::display::impl_fmt_traits;
+use bitcoin::hex::display::impl_fmt_traits;
 
 /// The payment hash is the hash of the [`PaymentPreimage`] which is the value used to lock funds
 /// in HTLCs while they transit the lightning network.