chore(deps-dev): bump aegir from 20.6.1 to 21.2.0 (#40)

Bumps [aegir](https://github.com/ipfs/aegir) from 20.6.1 to 21.2.0.
- [Release notes](https://github.com/ipfs/aegir/releases)
- [Changelog](https://github.com/ipfs/aegir/blob/master/CHANGELOG.md)
- [Commits](ipfs/aegir@v20.6.1...v21.2.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -42,7 +42,7 @@
   },
   "homepage": "https://github.com/libp2p/js-libp2p-pubsub#readme",
   "devDependencies": {
-    "aegir": "^20.4.1",
+    "aegir": "^21.2.0",
     "benchmark": "^2.1.4",
     "chai": "^4.2.0",
     "chai-spies": "^1.0.0",