all: bump kotlin_version to 2.2.21 (fixes #2255) (#2244)

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

Author: dependabot[bot]

build.gradle

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '2.2.20'
+    ext.kotlin_version = '2.2.21'
     repositories {
         jcenter()
         google()