Bump the rust-dependencies group with 2 updates

Bumps the rust-dependencies group with 2 updates: [serde_json](https://github.com/serde-rs/json) and [toml](https://github.com/toml-rs/toml).


Updates `serde_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)

Updates `toml` from 0.8.15 to 0.8.19
- [Commits](toml-rs/toml@toml-v0.8.15...toml-v0.8.19)

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

Signed-off-by: dependabot[bot] <support@github.com>