Bump kotlinx-serialization-json from 1.1.0 to 1.2.0 (#3710)

Bumps [kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) from 1.1.0 to 1.2.0.
- [Release notes](https://github.com/Kotlin/kotlinx.serialization/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md)
- [Commits](Kotlin/kotlinx.serialization@v1.1.0...v1.2.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

example/build.gradle

@@ -78,7 +78,7 @@ dependencies {
 
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlinCoroutinesVersion"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$kotlinCoroutinesVersion"
-    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.1.0"
+    implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:1.2.0"
 
     ktlint "com.pinterest:ktlint:$ktlintVersion"