Fix compile by upgrading mysql crate

Author: SSebo

Cargo.toml

@@ -28,15 +28,15 @@ maintenance = { status = "experimental" }
 
 [dependencies]
 nom = "7"
-mysql_common = { version = "0.28.0", features = ["chrono"] }
+mysql_common = { version = "0.29.1", features = ["chrono"] }
 byteorder = "1"
 chrono = "0.4"
 rustls = {version = "0.20.0", optional=true}
 
 [dev-dependencies]
 postgres = "0.19.1"
-mysql = "22"
-mysql_async = "0.29.0"
+mysql = "23"
+mysql_async = "0.31.0"
 slab = "0.4.2"
 tokio = { version = "1.15.0", features = ["full"] }
 futures = "0.3.0"