add an insecure codepoint

table.csv

@@ -108,6 +108,7 @@ garlic64,                       multiaddr,      0x01be,         draft,     I2P b
 garlic32,                       multiaddr,      0x01bf,         draft,     I2P base32 (hashed public key or encoded public key/checksum+optional secret)
 tls,                            multiaddr,      0x01c0,         draft,
 noise,                          multiaddr,      0x01c6,         draft,
+insecure,                       multiaddr,      0x01cb,         draft,
 quic,                           multiaddr,      0x01cc,         permanent,
 ws,                             multiaddr,      0x01dd,         permanent,
 wss,                            multiaddr,      0x01de,         permanent,