build(deps): bump org.jetbrains.kotlinx:kotlinx-serialization-json-jvm

Bumps [org.jetbrains.kotlinx:kotlinx-serialization-json-jvm](https://github.com/Kotlin/kotlinx.serialization) from 1.6.3 to 1.7.0.
- [Release notes](https://github.com/Kotlin/kotlinx.serialization/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md)
- [Commits](Kotlin/kotlinx.serialization@v1.6.3...v1.7.0)

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

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

backend/pom.xml

@@ -35,7 +35,7 @@
     <properties>
         <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
         <kotlin.code.style>official</kotlin.code.style>
-        <kotlin.serialization.version>1.6.3</kotlin.serialization.version>
+        <kotlin.serialization.version>1.7.0</kotlin.serialization.version>
         <kotlin.version>2.0.0</kotlin.version>
         <maven-compiler-plugin.version>3.13.0</maven-compiler-plugin.version>
         <maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>