Update Rust client

Signed-off-by: Andy Lok <andylokandy@hotmail.com>

Author: andylokandy

Cargo.lock

@@ -13,4 +13,4 @@ anyhow = "1"
 cxx = "=1.0.18"
 futures = "0.3"
 env_logger = "0.8"
-tikv-client = { git = "https://github.com/tikv/client-rust.git", rev = "89ac804" }
+tikv-client = { git = "https://github.com/tikv/client-rust.git", rev = "3fad149" }