chore: update vrf to 0.2.3

Author: tmpolaczyk

Cargo.lock

@@ -28,7 +28,7 @@ serde = { version = "1.0.104", features = ["derive"] }
 serde_cbor = "0.11.1"
 serde_json = "1.0.48"
 secp256k1 = "0.17.2"
-vrf = "0.2.2"
+vrf = "0.2.3"
 
 witnet_crypto = { path = "../crypto" }
 witnet_reputation = { path = "../reputation", features = ["serde"] }