Update dependency com.squareup.retrofit2:converter-gson to v2.9.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Update	Change
com.squareup.retrofit2:converter-gson	minor	2.8.2 -> 2.9.0

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Release Notes

square/retrofit

v2.9.0

Compare Source

• New: RxJava 3 adapter!

  The Maven coordinates are com.squareup.retrofit2:rxjava3-adapter.

  Unlike the RxJava 1 and RxJava 2 adapters, the RxJava 3 adapter's create() method will produce asynchronous HTTP requests by default. For synchronous requests use createSynchronous() and for synchronous on a scheduler use createWithScheduler(..).

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