fixup! Merge remote-tracking branch 'upstream/master' into rustup

Author: flip1995

clippy_utils/Cargo.toml

@@ -10,7 +10,6 @@ arrayvec = { version = "0.7", default-features = false }
 if_chain = "1.0"
 itertools = "0.10.1"
 rustc-semver = "1.1"
-serde = { version = "1.0" }
 
 [features]
 deny-warnings = ["clippy_config/deny-warnings"]