bump bitcoin version to 0.25

Author: RCasatta

Cargo.toml

@@ -18,7 +18,7 @@ path = "src/lib.rs"
 
 [dependencies]
 log = "^0.4"
-bitcoin = { version = "0.23", features = ["use-serde"] }
+bitcoin = { version = "0.25", features = ["use-serde"] }
 serde = { version = "^1.0", features = ["derive"] }
 serde_json = { version = "^1.0" }