build(deps): bump kotlin.version from 1.9.22 to 1.9.23

Bumps `kotlin.version` from 1.9.22 to 1.9.23.

Updates `org.jetbrains.kotlin:kotlin-maven-serialization` from 1.9.22 to 1.9.23

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk8` from 1.9.22 to 1.9.23
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `org.jetbrains.kotlin:kotlin-test-junit5` from 1.9.22 to 1.9.23
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 1.9.22 to 1.9.23

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-maven-serialization
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-test-junit5
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/pom.xml

@@ -36,7 +36,7 @@
         <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.version>1.9.22</kotlin.version>
+        <kotlin.version>1.9.23</kotlin.version>
         <maven-compiler-plugin.version>3.12.1</maven-compiler-plugin.version>
         <maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
         <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>