build(deps): bump @firebase/database-types from 0.9.7 to 0.9.8

Bumps [@firebase/database-types](https://github.com/firebase/firebase-js-sdk/tree/HEAD/packages/database-types) from 0.9.7 to 0.9.8.
- [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/database-types@0.9.8/packages/database-types)

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

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