Bump hash-db from 0.15.2 to 0.16.0
Bumps [hash-db](https://github.com/paritytech/trie) from 0.15.2 to 0.16.0.
- [Release notes](https://github.com/paritytech/trie/releases)
- [Commits](https://github.com/paritytech/trie/commits/hash-db-v0.16.0)
---
updated-dependencies:
- dependency-name: hash-db
dependency-type: direct:production
update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <[email protected]>