Update retrofit monorepo to v3 (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.retrofit2:converter-kotlinx-serialization	2.12.0 → 3.0.0
com.squareup.retrofit2:retrofit	2.12.0 → 3.0.0

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Release Notes

square/retrofit (com.squareup.retrofit2:converter-kotlinx-serialization)

v3.0.0

Compare Source

Changed

• Upgrade to OkHttp 4.12 (from 3.14).

  This is the version of OkHttp that is written in Kotlin, and as a result Retrofit now has a transitive Kotlin dependency. However, this is also the supported version of OkHttp whereas the previous version was out of support for nearly 4 years.

Note: The 3.x versions of Retrofit maintain forward binary-compatibility with the 2.x versions.
This means libraries compiled against 2.x can still be used with the 3.x versions.

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