build(deps): bump @firebase/database-types from 0.9.8 to 0.9.9

Bumps [@firebase/database-types](https://github.com/firebase/firebase-js-sdk/tree/HEAD/packages/database-types) from 0.9.8 to 0.9.9.
- [Release notes](https://github.com/firebase/firebase-js-sdk/releases)
- [Changelog](https://github.com/firebase/firebase-js-sdk/blob/master/packages/database-types/CHANGELOG.md)
- [Commits](https://github.com/firebase/firebase-js-sdk/commits/@firebase/[email protected]/packages/database-types)

---
updated-dependencies:
- dependency-name: "@firebase/database-types"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]