Bump org.jetbrains.kotlinx:multik-core from 0.2.3 to 0.3.1 (#119)

Bumps [org.jetbrains.kotlinx:multik-core](https://github.com/Kotlin/multik) from 0.2.3 to 0.3.1.
- [Release notes](https://github.com/Kotlin/multik/releases)
- [Changelog](https://github.com/Kotlin/multik/blob/develop/CHANGELOG.md)
- [Commits](Kotlin/multik@v0.2.3...0.3.1)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:multik-core
  dependency-version: 0.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 # libraries
 junit = "4.13.2"
-kotlinxMultik = "0.2.3"
+kotlinxMultik = "0.3.1"
 kotlinxSerializationJson = "1.10.0"
 
 # plugins