Merge pull request #9268 from nextcloud/dependabot/gradle/kotlin_version-1.6.0

Bump kotlin_version from 1.5.31 to 1.6.0

build.gradle

@@ -9,7 +9,7 @@ import org.gradle.internal.jvm.Jvm
 // its root folder, another one for the app module in subfolder of root.
 
 buildscript {
-    ext.kotlin_version = '1.5.31'
+    ext.kotlin_version = '1.6.0'
     ext.jacoco_version = '0.8.7'
     repositories {
         google()