Bump org.postgresql:postgresql in /debezium-server-iceberg-sink (#270)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.6.0 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:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

debezium-server-iceberg-sink/pom.xml

@@ -242,7 +242,7 @@
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
             <scope>test</scope>
-            <version>42.6.0</version>
+            <version>42.7.2</version>
         </dependency>
         <dependency>
             <groupId>mysql</groupId>