Bump org.postgresql:postgresql from 42.3.8 to 42.3.9 in /rdbms

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.8 to 42.3.9.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.3.8...REL42.3.9)

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

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

rdbms/pom.xml

@@ -21,7 +21,7 @@
         <commons-lang3.version>3.12.0</commons-lang3.version>
         <orientdb.version>3.1.8</orientdb.version>
         <mysql-connector-java.version>8.0.30</mysql-connector-java.version>
-        <postgresql.version>42.3.8</postgresql.version>
+        <postgresql.version>42.3.9</postgresql.version>
         <hsqldb.version>2.7.1</hsqldb.version>
         <dw-jdbc.version>0.4.4</dw-jdbc.version>
         <jackson-databind.version>2.16.1</jackson-databind.version>