chore(deps-dev): bump aegir from 20.6.1 to 21.2.0 (#44)

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] <[email protected]>

Author: dependabot-preview[bot]

package.json

@@ -48,7 +48,7 @@
     "sanitize-filename": "^1.6.1"
   },
   "devDependencies": {
-    "aegir": "^20.0.0",
+    "aegir": "^21.2.0",
     "chai": "^4.2.0",
     "chai-string": "^1.5.0",
     "datastore-fs": "^0.9.0",