Merge pull request #447 from owncloud/bump_several_dependencies

Bump Kotlin version to 1.5.31

Author: abelgardep

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        kotlinVersion = '1.5.21'
+        kotlinVersion = '1.5.31'
         moshiVersion = "1.12.0"
     }