fix hex-conservative version

Author: plebhash

protocols/v2/roles-logic-sv2/Cargo.toml

@@ -26,7 +26,7 @@ chacha20poly1305 = { version = "0.10.1"}
 nohash-hasher = "0.2.0"
 siphasher = "1"
 primitive-types = "0.13.1"
-hex = {package = "hex-conservative", version = "*"}
+hex = {package = "hex-conservative", version = "0.3.0"}
 
 [dev-dependencies]
 codec_sv2 = { path = "../../../protocols/v2/codec-sv2", version = "^2.0.0" }