Bump kotlinVersion from 1.8.10 to 1.8.21 (#2990)

Bumps `kotlinVersion` from 1.8.10 to 1.8.21.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 1.8.10 to 1.8.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.8.10...v1.8.21)

Updates `org.jetbrains.kotlin:kotlin-stdlib` from 1.8.10 to 1.8.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.8.10...v1.8.21)

---
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
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle

@@ -15,7 +15,7 @@ buildscript {
 
         classpath 'com.google.googlejavaformat:google-java-format:1.16.0'
         classpath 'com.android.tools.build:gradle:7.3.1'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.10"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.21"
     }
 }
 

gradle/dependencies.gradle

@@ -34,7 +34,7 @@ libraries.bndGradle =  'biz.aQute.bnd:biz.aQute.bnd.gradle:6.4.0'
 
 libraries.groovy = 'org.codehaus.groovy:groovy:3.0.17'
 
-def kotlinVersion = '1.8.10'
+def kotlinVersion = '1.8.21'
 libraries.kotlin = [
     version: kotlinVersion,