Bump multiplatform from 1.9.10 to 1.9.20 (#28)

Bumps [multiplatform](https://github.com/JetBrains/kotlin) from 1.9.10 to 1.9.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.10...v1.9.20)

---
updated-dependencies:
- dependency-name: multiplatform
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -5,7 +5,7 @@ import com.bmuschko.gradle.docker.tasks.image.DockerPullImage
 import io.gitlab.arturbosch.detekt.Detekt
 
 plugins {
-    val kotlinVersion = "1.9.10"
+    val kotlinVersion = "1.9.20"
     kotlin("multiplatform") version kotlinVersion
     id("com.bmuschko.docker-remote-api") version "9.3.3"
     id("io.gitlab.arturbosch.detekt").version("1.23.0")