Update comrak requirement from 0.12 to 0.13 in /services/autorust#6

dependabot[bot] wants to merge 1 commit intomainrylev/azure-sdk-for-rust:mainfrom

dependabot/cargo/services/autorust/comrak-0.13rylev/azure-sdk-for-rust:dependabot/cargo/services/autorust/comrak-0.13Copy head branch name to clipboard