deps(dev): bump aegir from 38.1.8 to 39.0.8

Bumps [aegir](https://github.com/ipfs/aegir) from 38.1.8 to 39.0.8.
- [Release notes](https://github.com/ipfs/aegir/releases)
- [Changelog](https://github.com/ipfs/aegir/blob/master/CHANGELOG.md)
- [Commits](ipfs/aegir@v38.1.8...v39.0.8)

---
updated-dependencies:
- dependency-name: aegir
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -173,7 +173,7 @@
  "it-stream-types": "^2.0.1"
  },
  "devDependencies": {
- "aegir": "^38.1.7",
+ "aegir": "^39.0.8",
  "delay": "^5.0.0",
  "it-drain": "^3.0.1",
  "it-pipe": "^3.0.1"