Fix postgres-protocol constraint

Closes sfackler#1012

Author: sfackler

tokio-postgres/Cargo.toml

@@ -53,7 +53,7 @@ parking_lot = "0.12"
 percent-encoding = "2.0"
 pin-project-lite = "0.2"
 phf = "0.11"
-postgres-protocol = { version = "0.6.4", path = "../postgres-protocol" }
+postgres-protocol = { version = "0.6.5", path = "../postgres-protocol" }
 postgres-types = { version = "0.2.4", path = "../postgres-types" }
 socket2 = { version = "0.5", features = ["all"] }
 tokio = { version = "1.27", features = ["io-util"] }