chore(deps): pin bdk_wallet to exact version 2.1.0

Prevent cargo from resolving to 2.3.0+
where SignOptions is deprecated
and `just pre-push` fails because of that.

Author: va-an

Cargo.lock

@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 
 [dependencies]
-bdk_wallet = { version = "2.1.0", features = ["rusqlite", "keys-bip39", "compiler", "std"] }
+bdk_wallet = { version = "=2.1.0", features = ["rusqlite", "keys-bip39", "compiler", "std"] }
 clap = { version = "4.6", features = ["derive","env"] }
 clap_complete = "4.6"
 dirs = {  version = "6.0.0" }