chore(deps): update plugin spotless to v6.13.0 (#388)

Author: renovate[bot]

gradle/libs.versions.toml

@@ -30,4 +30,4 @@ kotlin-multiplaform = { id = "org.jetbrains.kotlin.multiplatform", version.ref =
 kotlinx-serialization = { id = "org.jetbrains.kotlin.plugin.serialization", version.ref = "kotlin" }
 kotlinx-binary-validator = { id = "org.jetbrains.kotlinx.binary-compatibility-validator", version = "0.11.1" }
 maven-publish = { id = "com.vanniktech.maven.publish", version = "0.22.0" }
-spotless = { id = "com.diffplug.gradle.spotless", version = "6.11.0" }
+spotless = { id = "com.diffplug.gradle.spotless", version = "6.13.0" }