Bump mockito-core from 3.1.0 to 3.2.4

Bumps [mockito-core](https://github.com/mockito/mockito) from 3.1.0 to 3.2.4.
- [Release notes](https://github.com/mockito/mockito/releases)
- [Commits](mockito/mockito@v3.1.0...v3.2.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -56,7 +56,7 @@ dependencies {
 
     testCompile group: 'cd.go.plugin', name: 'go-plugin-api', version: '19.7.0'
     testCompile group: 'junit', name: 'junit', version: '4.13'
-    testCompile group: 'org.mockito', name: 'mockito-core', version: '3.1.0'
+    testCompile group: 'org.mockito', name: 'mockito-core', version: '3.2.4'
     testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '2.2'
     testCompile group: 'org.skyscreamer', name: 'jsonassert', version: '1.5.0'
     testCompile 'com.squareup.okhttp3:mockwebserver:4.3.1'