[pom] Fix derby upgrade comment - should be java 8 not 7.

Author: hazendaz

pom.xml

@@ -100,7 +100,7 @@
     <dependency>
       <groupId>org.apache.derby</groupId>
       <artifactId>derby</artifactId>
-      <version>10.12.1.1</version> <!-- Retain until on java 7 -->
+      <version>10.12.1.1</version> <!-- Retain until on java 8 -->
       <scope>test</scope>
     </dependency>
     <dependency>