Bump postgresql from 42.3.6 to 42.4.0 (#1298)

Author: dependabot[bot]

pom.xml

@@ -276,7 +276,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.3.6</version>
+      <version>42.4.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>