chore: remove unused dep

Author: achingbrain

examples/js-libp2p-example-connection-encryption/package.json

@@ -18,7 +18,6 @@
   "dependencies": {
     "@chainsafe/libp2p-noise": "^13.0.0",
     "@chainsafe/libp2p-yamux": "^5.0.0",
-    "@libp2p/mplex": "^9.0.0",
     "@libp2p/tcp": "^8.0.0",
     "it-pipe": "^3.0.1",
     "libp2p": "^0.46.16",