chore(deps-dev): bump aegir from 20.6.1 to 21.3.0 (#567)

Bumps [aegir](https://github.com/ipfs/aegir) from 20.6.1 to 21.3.0.
- [Release notes](https://github.com/ipfs/aegir/releases)
- [Changelog](https://github.com/ipfs/aegir/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ipfs/aegir/compare/v20.6.1...v21.3.0)

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

package.json

@@ -78,7 +78,7 @@
   "devDependencies": {
     "@nodeutils/defaults-deep": "^1.1.0",
     "abortable-iterator": "^3.0.0",
-    "aegir": "^20.5.1",
+    "aegir": "^21.3.0",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "cids": "^0.7.1",