Update dependency io.wcm:io.wcm.testing.aem-mock.junit5 to v5.6.8

Author: renovate[bot]

pom.xml

@@ -160,7 +160,7 @@
     <dependency>
       <groupId>io.wcm</groupId>
       <artifactId>io.wcm.testing.aem-mock.junit5</artifactId>
-      <version>5.5.0</version>
+      <version>5.6.8</version>
       <scope>test</scope>
     </dependency>
     <dependency>