chore: bump the patch group across 1 directory with 2 updates

Bumps the patch group with 2 updates in the /src/rust directory: [once_cell](https://github.com/matklad/once_cell) and [serde_json](https://github.com/serde-rs/json).


Updates `once_cell` from 1.20.2 to 1.20.3
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.20.2...v1.20.3)

Updates `serde_json` from 1.0.135 to 1.0.138
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.135...v1.0.138)

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

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

src/rust/Cargo.toml

@@ -43,7 +43,7 @@ extendr-api = { git = "https://github.com/extendr/extendr", rev = "1895bfc8ee223
 flume = "0.11.1"
 indenter = "0.3.3"
 ipc-channel = "0.18.3"
-once_cell = "1.20.2"
+once_cell = "1.20.3"
 rayon = "1.10.0"
 serde = { version = "1.0.217", features = ["derive"] }
 serde_json = "*"