Exclude mockito from packaging

The mockito library is only used in tests so it should be scoped to
tests.

Prevent unnecessary inclusion of mockito and its dependencies in the
final hpi file.

pom.xml

@@ -65,6 +65,7 @@
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
       <version>4.8.1</version>
+      <scope>test</scope>
     </dependency>
   </dependencies>