Merge pull request #3043 from gedoor/dependabot/gradle/kotlin_version-1.8.21

Bump kotlin_version from 1.8.20 to 1.8.21

build.gradle

@@ -4,7 +4,7 @@ buildscript {
     ext{
         compile_sdk_version = 33
         build_tool_version = '33.0.1'
-        kotlin_version = '1.8.20'
+        kotlin_version = '1.8.21'
         agp_version = '8.0.0'
         exoplayer_version = '2.18.6'
         splitties_version = '3.0.0'