Revert "Upgrade to derby 10.15.1.3"

This reverts commit bf86187.

Author: kazuki43zoo

pom.xml

@@ -209,7 +209,7 @@
     <dependency>
       <groupId>org.apache.derby</groupId>
       <artifactId>derby</artifactId>
-      <version>10.15.1.3</version>
+      <version>10.14.2.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>