Bump org.postgresql:postgresql in /xoom-eventjournal

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.3 to 42.7.2.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/commits)

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

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

xoom-eventjournal/pom.xml

@@ -54,7 +54,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.4.3</version>
+      <version>42.7.2</version>
     </dependency>
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>