imp: deprecate ErrPacketTimeout error (#5626)

Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

modules/core/04-channel/types/errors.go

@@ -18,11 +18,15 @@ var (
 	ErrSequenceReceiveNotFound   = errorsmod.Register(SubModuleName, 11, "sequence receive not found")
 	ErrSequenceAckNotFound       = errorsmod.Register(SubModuleName, 12, "sequence acknowledgement not found")
 	ErrInvalidPacket             = errorsmod.Register(SubModuleName, 13, "invalid packet")
-	ErrPacketTimeout             = errorsmod.Register(SubModuleName, 14, "packet timeout")
-	ErrTooManyConnectionHops     = errorsmod.Register(SubModuleName, 15, "too many connection hops")
-	ErrInvalidAcknowledgement    = errorsmod.Register(SubModuleName, 16, "invalid acknowledgement")
-	ErrAcknowledgementExists     = errorsmod.Register(SubModuleName, 17, "acknowledgement for packet already exists")
-	ErrInvalidChannelIdentifier  = errorsmod.Register(SubModuleName, 18, "invalid channel identifier")
+
+	// Deprecated: ErrPacketTimeout is deprecated and will be removed in a future release.
+	// Please use ErrTimeoutElapsed instead.
+	ErrPacketTimeout = errorsmod.Register(SubModuleName, 14, "packet timeout")
+
+	ErrTooManyConnectionHops    = errorsmod.Register(SubModuleName, 15, "too many connection hops")
+	ErrInvalidAcknowledgement   = errorsmod.Register(SubModuleName, 16, "invalid acknowledgement")
+	ErrAcknowledgementExists    = errorsmod.Register(SubModuleName, 17, "acknowledgement for packet already exists")
+	ErrInvalidChannelIdentifier = errorsmod.Register(SubModuleName, 18, "invalid channel identifier")
 
 	// packets already relayed errors
 	ErrPacketReceived           = errorsmod.Register(SubModuleName, 19, "packet already received")