Duh, update dependency version as well

Author: djc

tokio-imap/Cargo.toml

@@ -19,7 +19,7 @@ maintenance = { status = "passively-maintained" }
 bytes = "1"
 futures-util = "0.3.8"
 futures-sink = "0.3.8"
-imap-proto = { version = "0.12", path = "../imap-proto" }
+imap-proto = { version = "0.13", path = "../imap-proto" }
 nom = "6"
 pin-project = "1"
 tokio = { version = "1", features = ["net"] }