fix(nix): update vendorHash and vendor dir for new deps

vendor/github.com/refraction-networking/utls/dicttls/heartbeat_mode.go

@@ -0,0 +1,19 @@
+package dicttls
+
+// source: https://www.iana.org/assignments/tls-parameters/heartbeat-modes.csv
+// last updated: March 2023
+
+const (
+	HeartbeatMode_peer_allowed_to_send     uint8 = 1
+	HeartbeatMode_peer_not_allowed_to_send uint8 = 2
+)
+
+var DictHeartbeatModeValueIndexed = map[uint8]string{
+	1: "peer_allowed_to_send",
+	2: "peer_not_allowed_to_send",
+}
+
+var DictHeartbeatModeNameIndexed = map[string]uint8{
+	"peer_allowed_to_send":     1,
+	"peer_not_allowed_to_send": 2,
+}