fix: set `@types/cobody` as a dependency

[samchungy]

To switch to @koa/bodyparser we have to awkwardly declare a dependency on @types/cobody or resort to using skipLibCheck as this library is referencing types it whilst declaring it as a devDependency.

This PR sets @types/cobody as a dependency.

Checklist

• [x] I have ensured my pull request is not behind the main or master branch of the original repository.
• [x] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• [x] I have written a commit message that passes commitlint linting.
• [x] I have ensured that my code changes pass linting tests.
• [x] I have ensured that my code changes pass unit tests.
• [x] I have described my pull request and the reasons for code changes along with context if necessary.

[samchungy]

@3imed-jaberi, @fengmk2 @titanism Could you please take a look? Cheers 🙏