Update postgres to v0.19.1

Author: kellerkindt

Cargo.toml

@@ -35,7 +35,7 @@ serde = "1.0.115"
 serde_derive = "1.0.115"
 
 # feature postgres
-postgres = { version = "0.17.5", optional = true }
+postgres = { version = "0.19.1", optional = true }
 
 # feature async-psql
 tokio = { version = "1.8.1", optional = true, features = ["macros"]  }