chore(deps): bump kotlin_version from 1.9.10 to 1.9.21 (#292)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.9.10'
+    ext.kotlin_version = '1.9.21'
 
     repositories {
         mavenCentral()