chore(deps-dev): bump aegir from 20.6.1 to 21.0.2

Bumps [aegir](https://github.com/ipfs/aegir) from 20.6.1 to 21.0.2.
- [Release notes](https://github.com/ipfs/aegir/releases)
- [Changelog](https://github.com/ipfs/aegir/blob/master/CHANGELOG.md)
- [Commits](ipfs/aegir@v20.6.1...v21.0.2)

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

Author: dependabot-preview[bot]

package.json

@@ -34,7 +34,7 @@
   },
   "homepage": "https://github.com/libp2p/js-libp2p-mdns",
   "devDependencies": {
-    "aegir": "^20.3.1",
+    "aegir": "^21.0.2",
     "chai": "^4.2.0",
     "delay": "^4.3.0",
     "dirty-chai": "^2.0.1",