Fix for backwards-incompatible change in ed25519-zebra (smol-dot#2180)

* Fix for backwards-incompatible change in ed25519-zebra

* Fix missing feature for `hex` as a result

Author: tomaka

Cargo.lock

@@ -45,13 +45,13 @@ bs58 = { version = "0.5.1", default-features = false, features = ["alloc"] }
 chacha20 = { version = "0.9.1", default-features = false }
 crossbeam-queue = { version = "0.3.11", default-features = false, features = ["alloc"] }
 derive_more = { version = "2.0", default-features = false, features = ["full"] }
-ed25519-zebra = { version = "4.0.1", default-features = false }
+ed25519-zebra = { version = "4.1.0", default-features = false, features = ["alloc"] }
 either = { version = "1.9.0", default-features = false }
 event-listener = { version = "5.3.0", default-features = false }
 fnv = { version = "1.0.7", default-features = false }
 futures-lite = { version = "2.3.0", default-features = false, features = ["alloc"] }
 hashbrown = { version = "0.15.0", default-features = false, features = ["raw-entry", "serde"] }   # TODO: remove serde feature
-hex = { version = "0.4.3", default-features = false }
+hex = { version = "0.4.3", default-features = false, features = ["alloc"] }
 hmac = { version = "0.12.1", default-features = false }
 itertools = { version = "0.14.0", default-features = false }
 libm = { version = "0.2.8", default-features = false }