Changed the mockito version to 3.4.2 (Git issue : 14246)

In Mocktio 3.4.0, static mocks causes NotAMockException. They are fixed in 3.4.2.
[1] : mockito/mockito#1968
[2]: mockito/mockito#1967

pom.xml

@@ -88,7 +88,7 @@
 
         <junit.version>4.12</junit.version>
         <hamcrest.version>1.3</hamcrest.version>
-        <mockito.version>3.4.0</mockito.version>
+        <mockito.version>3.4.2</mockito.version>
         <logback.version>1.2.0</logback.version>
 
         <hikari-cp.version>3.4.2</hikari-cp.version>