Bump kotlin-stdlib from 1.4.21 to 1.4.21-2 (mockito#2157)

Bumps [kotlin-stdlib](https://github.com/JetBrains/kotlin) from 1.4.21 to 1.4.21-2.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog-1.3.X.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

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

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

Author: dependabot[bot]

gradle/dependencies.gradle

@@ -35,7 +35,7 @@ libraries.osgi = 'org.osgi:osgi.core:8.0.0'
 libraries.equinox = 'org.eclipse.platform:org.eclipse.osgi:3.16.100'
 libraries.bndGradle =  'biz.aQute.bnd:biz.aQute.bnd.gradle:5.2.0'
 
-def kotlinVersion = '1.4.21'
+def kotlinVersion = '1.4.21-2'
 libraries.kotlin = [
     version: kotlinVersion,