[Request] Update Typescript and used angular to the latest version

Created by: Geigerkind

Bug Report Checklist

• Have you searched for related issues/PRs?

Description

I would like to build my whole angular project with recent package, but the package.json generated by OpenAPI still requires version 4.0.8 in the latest version.

openapi-generator version

5.2.0

Suggest a fix

Please update the typescript version to >= 4.3.5 and angular to 12