Add qs as a dev dependency of the api package

[stof]

Issue:

What I did

qs is used in the testsuite of the api package. #16440 removed qs from dependencies, but without adding it in devDependencies (the CI works thanks to the hoisting of qs from a transitive dependency).

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[nx-cloud]

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[shilman]

Thanks so much @stof !!!! 🙏