Update comrak requirement from 0.18 to 0.19 in /services/autorust (#1434)

Updates the requirements on [comrak](https://github.com/kivikakk/comrak) to permit the latest version.
- [Release notes](https://github.com/kivikakk/comrak/releases)
- [Changelog](https://github.com/kivikakk/comrak/blob/main/changelog.txt)
- [Commits](https://github.com/kivikakk/comrak/compare/0.18.0...0.19.0)

---
updated-dependencies:
- dependency-name: comrak
  dependency-type: direct:production
...

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services/autorust/codegen/Cargo.toml

@@ -17,7 +17,7 @@ heck = "0.4"
 regex = "1.7"
 indexmap = { version = "2.0", features = ["serde"] }
 path_abs = "0.5"
-comrak = "0.18"
+comrak = "0.19"
 serde = "1.0"
 http-types = "2.12"
 once_cell = "1.16"