build(deps): bump serde from 1.0.197 to 1.0.198 (#210)

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.197 to 1.0.198.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.197...v1.0.198)

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

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Author: dependabot[bot]