Bumps [parity-db](https://github.com/paritytech/parity-db) from 0.3.9 to 0.3.12.
- [Release notes](https://github.com/paritytech/parity-db/releases)
- [Commits](https://github.com/paritytech/parity-db/commits/v0.3.12)

---
updated-dependencies:
- dependency-name: parity-db
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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