chore(deps): Bump version_kotlin from 2.0.20 to 2.0.21

Bumps `version_kotlin` from 2.0.20 to 2.0.21.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk7` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -3,7 +3,7 @@
 buildscript {
     ext.version_code = 2003001
     ext.version_name = '2.3.1'
-    ext.version_kotlin = '2.0.20'
+    ext.version_kotlin = '2.0.21'
     ext.version_sso = '1.3.2'
     ext.version_android_commons = '1.0.2'