remove regex-syntax in Cargo.toml

Author: xiedeyantu

datafusion/optimizer/Cargo.toml

@@ -63,7 +63,6 @@ itertools = { workspace = true }
 log = { workspace = true }
 recursive = { workspace = true, optional = true }
 regex = { workspace = true }
-regex-syntax = "0.8.9"
 
 [dev-dependencies]
 async-trait = { workspace = true }