Bump postgresql from 42.3.3 to 42.4.1 in /pn-sync

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.3 to 42.4.1.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.3.3...REL42.4.1)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pn-sync/pom.xml

@@ -52,7 +52,7 @@
         <dependency>
           <groupId>org.postgresql</groupId>
           <artifactId>postgresql</artifactId>
-          <version>42.3.3</version>
+          <version>42.4.1</version>
         </dependency>
         <dependency>
           <groupId>net.sf.saxon</groupId>