specify serde version compatible with codebase

Author: pitaj

Cargo.toml

@@ -45,7 +45,7 @@ derive-new = "0.5"
 if_chain = "1.0"
 itertools = "0.10.1"
 quote = "1.0"
-serde = { version = "1.0", features = ["derive"] }
+serde = { version = "1.0.125", features = ["derive"] }
 syn = { version = "1.0", features = ["full"] }
 futures = "0.3"
 parking_lot = "0.11.2"