Bump multiplatform from 1.7.10 to 1.7.20 (#68)

Bumps [multiplatform](https://github.com/JetBrains/kotlin) from 1.7.10 to 1.7.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.7.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.7.10...v1.7.20)

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

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>
Co-authored-by: Philip Wedemann <[email protected]>

Author: dependabot[bot]

build.gradle.kts

@@ -3,7 +3,7 @@ import org.jetbrains.kotlin.gradle.dsl.*
 import java.util.*
 
 plugins {
-    kotlin("multiplatform") version "1.7.10" apply false
+    kotlin("multiplatform") version "1.7.20" apply false
     `maven-publish`
     signing
     id("io.github.gradle-nexus.publish-plugin") version "1.1.0"