chore: move from deprecated multiplex dep to libp2p-mplex

package.json

@@ -127,7 +127,7 @@
     "libp2p-kad-dht": "~0.9.0",
     "libp2p-keychain": "~0.3.1",
     "libp2p-mdns": "~0.9.2",
-    "libp2p-multiplex": "~0.5.1",
+    "libp2p-mplex": "^0.6.0",
     "libp2p-railing": "~0.7.1",
     "libp2p-secio": "~0.9.3",
     "libp2p-tcp": "~0.11.6",

src/core/runtime/libp2p-browser.js

@@ -3,7 +3,7 @@
 const WS = require('libp2p-websockets')
 const WebRTCStar = require('libp2p-webrtc-star')
 const WebSocketStar = require('libp2p-websocket-star')
-const Multiplex = require('libp2p-multiplex')
+const Multiplex = require('libp2p-mplex')
 const SECIO = require('libp2p-secio')
 const Railing = require('libp2p-railing')
 const libp2p = require('libp2p')

src/core/runtime/libp2p-nodejs.js

@@ -6,7 +6,7 @@ const WS = require('libp2p-websockets')
 const WebSocketStar = require('libp2p-websocket-star')
 const Railing = require('libp2p-railing')
 const KadDHT = require('libp2p-kad-dht')
-const Multiplex = require('libp2p-multiplex')
+const Multiplex = require('libp2p-mplex')
 const SECIO = require('libp2p-secio')
 const libp2p = require('libp2p')