Bump serde_json from 1.0.120 to 1.0.121

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.120 to 1.0.121.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.120...v1.0.121)

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

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