chore(deps): bump libp2p-pubsub from 0.4.6 to 0.5.6

Bumps [libp2p-pubsub](https://github.com/libp2p/js-libp2p-pubsub) from 0.4.6 to 0.5.6.
- [Release notes](https://github.com/libp2p/js-libp2p-pubsub/releases)
- [Changelog](https://github.com/libp2p/js-libp2p-pubsub/blob/master/CHANGELOG.md)
- [Commits](libp2p/js-libp2p-pubsub@v0.4.6...v0.5.6)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

package-lock.json

@@ -63,7 +63,7 @@
     "ipfs-repo": "^3.0.2",
     "is-ipfs": "^1.0.3",
     "js-sha256": "^0.9.0",
-    "libp2p-pubsub": "^0.4.6",
+    "libp2p-pubsub": "^0.5.6",
     "lodash.merge": "^4.6.2",
     "muport-did-resolver": "^1.0.2",
     "node-fetch": "^2.6.0",