fix(deps): update dependency org.mockito:mockito-core to v4

Author: renovate[bot]

pom.xml

@@ -34,7 +34,7 @@
     <joda-time.version>2.11.2</joda-time.version>
     <junit.version>4.13.2</junit.version>
     <logback.version>1.4.3</logback.version>
-    <mockito.version>1.10.19</mockito.version>
+    <mockito.version>4.8.0</mockito.version>
     <portlet-api.version>2.0</portlet-api.version>
     <resource-server.version>1.0.42</resource-server.version>
     <servlet-api.version>2.5</servlet-api.version>