fix: restore smplx-std in Cargo.toml

Author: LesterEvSe

Cargo.toml

@@ -13,6 +13,7 @@ smplx-build = { path = "./crates/build", version = "0.0.8" }
 smplx-test = { path = "./crates/test", version = "0.0.8" }
 smplx-regtest = { path = "./crates/regtest", version = "0.0.8" }
 smplx-sdk = { path = "./crates/sdk", version = "0.0.8" }
+smplx-std = { path = "./crates/simplex", version = "0.0.8" }
 
 serde = { version = "1.0.228", features = ["derive"] }
 hex = { version = "0.4.3" }