Update comrak requirement from 0.17 to 0.18 in /services/autorust (#1257)

Author: dependabot[bot]

services/autorust/codegen/Cargo.toml

@@ -17,7 +17,7 @@ heck = "0.4"
 regex = "1.7"
 indexmap = { version = "1.9", features = ["serde-1"] }
 path_abs = "0.5"
-comrak = "0.17"
+comrak = "0.18"
 serde = "1.0"
 http-types = "2.12"
 once_cell = "1.16"