Bump postgresql from 42.3.6 to 42.4.0

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.6 to 42.4.0.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.3.6...REL42.4.0)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -235,7 +235,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.3.6</version>
+      <version>42.4.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>