Bump org.postgresql:postgresql in /frameworks/Java/light-java

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 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] <[email protected]>

frameworks/Java/light-java/pom.xml

@@ -28,7 +28,7 @@
         <version.undertow>2.3.5.Final</version.undertow>
         <version.hikaricp>3.3.1</version.hikaricp>
         <version.mysql>8.0.28</version.mysql>
-        <version.postgres>42.4.1</version.postgres>
+        <version.postgres>42.7.2</version.postgres>
         <version.dsl-json>1.8.4</version.dsl-json>
         <version.mustache>0.9.6</version.mustache>
         <version.maven-compiler-plugin>3.8.0</version.maven-compiler-plugin>