deps: bump ipfs-unixfs-exporter from 13.6.5 to 13.6.6 (#777)

Bumps [ipfs-unixfs-exporter](https://github.com/ipfs/js-ipfs-unixfs) from 13.6.5 to 13.6.6.
- [Release notes](https://github.com/ipfs/js-ipfs-unixfs/releases)
- [Commits](ipfs/js-ipfs-unixfs@ipfs-unixfs-exporter-13.6.5...ipfs-unixfs-exporter-13.6.6)

---
updated-dependencies:
- dependency-name: ipfs-unixfs-exporter
  dependency-version: 13.6.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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