Adjust edition in cargo.toml

Author: Liquid369

Cargo.toml

@@ -1,13 +1,13 @@
 [package]
 name = "pivx_rpc_rs"
 version = "0.1.0"
-edition = "2023"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 failure = "0.1.5"
 reqwest = "0.9.18"
 serde = { version = "1.0.92", features = ["derive"] }
-serde_json = { version = "1.0.39", features = ["arbitrary_precision"] }
+serde_json = { version = "1.0.39" }
 throttled_json_rpc = "0.0.5"