ref #7976 - update mockito to support JDK9+

Author: frantuma

modules/swagger-codegen/pom.xml

@@ -305,7 +305,7 @@
         <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
-            <version>2.8.47</version>
+            <version>2.24.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>