Update deadpool to 0.11

Author: jrandolf

Cargo.toml

@@ -23,7 +23,7 @@ mysql_async = { version = ">=0.30.0,<0.34", optional = true, default-features =
 mysql_common = {version = ">=0.29.0,<0.32.0", optional = true, default-features = false, features = ["frunk", "derive"]}
 
 bb8 = {version = "0.8", optional = true}
-deadpool = {version = "0.10", optional = true, default-features = false, features = ["managed"] }
+deadpool = {version = "0.11", optional = true, default-features = false, features = ["managed"] }
 mobc = {version = ">=0.7,<0.10", optional = true}
 scoped-futures = {version = "0.1", features = ["std"]}