common.gradle: upgrade mockito-core to v3.8.0

common.gradle

@@ -40,7 +40,7 @@ repositories {
 dependencies {
     // Adding dependencies here will add the dependencies to each subproject.
     testCompile 'junit:junit:4.13.2'
-    testCompile group: 'org.mockito', name: 'mockito-core', version: '3.0.0'
+    testCompile 'org.mockito:mockito-core:3.8.0'
     testCompile group: 'org.easytesting', name: 'fest-assert-core', version: '2.0M10'
     testCompile 'org.codehaus.groovy:groovy-all:3.0.7'
 }