build(deps): update rustdoc-json requirement

Updates the requirements on [rustdoc-json](https://github.com/Enselic/cargo-public-api) to permit the latest version.

Updates `rustdoc-json` to 0.8.9
- [Release notes](https://github.com/Enselic/cargo-public-api/releases)
- [Changelog](https://github.com/Enselic/cargo-public-api/blob/main/rustdoc-json/CHANGELOG.md)
- [Commits](https://github.com/Enselic/cargo-public-api/compare/rustdoc-json-v0.8.6...rustdoc-json-v0.8.9)

---
updated-dependencies:
- dependency-name: rustdoc-json
  dependency-type: direct:production
  dependency-group: production-dependencies
...

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

Cargo.toml

@@ -85,7 +85,7 @@ public-api = { version = "0.33.1", default-features = false }
 quote = { version = "1", default-features = false }
 rand = { version = "0.8", default-features = false }
 rbpf = { version = "0.2.0", default-features = false }
-rustdoc-json = { version = "0.8.6", default-features = false }
+rustdoc-json = { version = "0.9.0", default-features = false }
 rustup-toolchain = { version = "0.1.5", default-features = false }
 rustversion = { version = "1.0.0", default-features = false }
 syn = { version = "2", default-features = false }