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

[tdymel]

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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

[tdymel]

Sorry relates to this:
#9511