fix(deps): update dependency bencode to v4 (webtorrent#487)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -29,7 +29,7 @@
   "dependencies": {
     "@thaunknown/simple-peer": "^9.12.1",
     "@thaunknown/simple-websocket": "^9.1.0",
-    "bencode": "^3.0.3",
+    "bencode": "^4.0.0",
     "bittorrent-peerid": "^1.3.3",
     "chrome-dgram": "^3.0.6",
     "clone": "^2.0.0",