libs: use mockito-2.22.0 with java11 support

Motivation:
as java 11 is released update dependencies to support it.

Modification:
use mockito-2.22

Result:
code can be build and tested with java11

Acked-by: Olufemi Adeyemi
Target: master, 3.0

pom.xml

@@ -69,7 +69,7 @@
 
     <!--  version of test dependencies  -->
     <junit.version>4.12</junit.version>
-    <mockito-core.version>2.10.0</mockito-core.version>
+    <mockito-core.version>2.22.0</mockito-core.version>
     <logback-classic.version>1.2.3</logback-classic.version>
   </properties>