Update to postgresql 42.1.4.jre6

Fixes gh-1078

Author: kazuki43zoo

pom.xml

@@ -243,7 +243,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.1.1.jre6</version>
+      <version>42.1.4.jre6</version>
       <scope>test</scope>
     </dependency>
     <dependency>