Bump kotlinx-serialization-json from 1.3.3 to 1.4.0 (#604)

Bumps [kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) from 1.3.3 to 1.4.0.
- [Release notes](https://github.com/Kotlin/kotlinx.serialization/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md)
- [Commits](Kotlin/kotlinx.serialization@v1.3.3...v1.4.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:kotlinx-serialization-json
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

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

shared/build.gradle.kts

@@ -21,7 +21,7 @@ kotlin {
  commonMain {
  dependencies {
  // Apache 2, https://github.com/Kotlin/kotlinx.serialization/releases/latest
- api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.3.3")
+ api("org.jetbrains.kotlinx:kotlinx-serialization-json:1.4.0")
 
  // Apache 2, https://github.com/Kotlin/kotlinx-datetime/releases
  api("org.jetbrains.kotlinx:kotlinx-datetime:0.4.0")