chore(deps): update kotlin to 1.6.0 (#6)

Author: petertrr

gradle/libs.versions.toml

@@ -1,10 +1,10 @@
 [versions]
-kotlin = "1.5.31"
+kotlin = "1.6.0"
 junit = "5.8.1"
 
 [plugins]
 kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 
 [libraries]
 junit-jupiter-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
-junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }
+junit-jupiter-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }