Update dependency org.postgresql:postgresql to v42.6.0

Author: renovate[bot]

pom.xml

@@ -272,7 +272,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.5.4</version>
+      <version>42.6.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>