build(deps): bump serde in /implementations/rust-jsonschema

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.188 to 1.0.190.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.188...v1.0.190)

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

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