deps: bump p-event from 5.0.1 to 6.0.0 (libp2p#182)

Bumps [p-event](https://github.com/sindresorhus/p-event) from 5.0.1 to 6.0.0.
- [Release notes](https://github.com/sindresorhus/p-event/releases)
- [Commits](sindresorhus/p-event@v5.0.1...v6.0.0)

---
updated-dependencies:
- dependency-name: p-event
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -158,7 +158,7 @@
     "multiformats": "^11.0.2",
     "multihashes": "^4.0.3",
     "p-defer": "^4.0.0",
-    "p-event": "^5.0.1",
+    "p-event": "^6.0.0",
     "protons-runtime": "^5.0.0",
     "uint8arraylist": "^2.4.3",
     "uint8arrays": "^4.0.3"