update test dependency of nl.jqno.equalsverifier:equalsverifier

Author: agebhar1

core/pom.xml

@@ -104,7 +104,7 @@
         <dependency>
             <groupId>nl.jqno.equalsverifier</groupId>
             <artifactId>equalsverifier</artifactId>
-            <version>2.1.6</version>
+            <version>2.1.8</version>
             <scope>test</scope>
         </dependency>
     </dependencies>