Update kotlinx.serialization to v1.7.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlinx:kotlinx-serialization-json	1.6.3 -> 1.7.0
org.jetbrains.kotlinx:kotlinx-serialization-core	1.6.3 -> 1.7.0

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Release Notes

Kotlin/kotlinx.serialization (org.jetbrains.kotlinx:kotlinx-serialization-json)

v1.7.0

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This release contains all of the changes from 1.7.0-RC and is compatible with Kotlin 2.0.
Please note that for reasons explained in the 1.7.0-RC changelog, it may not be possible to use it with the Kotlin 1.9.x
compiler plugin. Yet, it is still fully backwards compatible with previous versions.

The only difference with 1.7.0-RC is that classDiscriminatorMode property in JsonBuilder is marked as experimental,
as it should have been when it was introduced (#​2680).

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Configuration

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[yschimke]

e: file:///home/runner/work/okhttp/okhttp/okhttp/src/test/java/okhttp3/WebPlatformToAsciiData.kt:27:1 Your current Kotlin version is 1.9.23, while kotlinx.serialization core runtime 1.7.0 requires at least Kotlin 2.0.0-RC1. Please update your Kotlin compiler and IDE plugin.

[renovate]

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