Bump mockito-core from 3.2.0 to 3.2.4 (#6764)

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.2.0 to 3.2.4.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.2.0...v3.2.4)

Signed-off-by: dependabot-preview[bot] 

Author: dependabot-preview[bot]

build.gradle

@@ -6,7 +6,7 @@ buildscript {
   ext.reactiveStreamsVersion = "1.0.3"
   ext.junitVersion = "4.12"
   ext.testNgVersion = "7.0.0"
-  ext.mockitoVersion = "3.2.0"
+  ext.mockitoVersion = "3.2.4"
   ext.jmhLibVersion = "1.21"
   ext.jmhGradleVersion = "0.5.0"
   ext.guavaVersion = "28.1-jre"