build(deps): bump org.postgresql:postgresql (#3950)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.3 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@REL42.3.3...REL42.3.9)

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

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

extensions/kafka-connect-jdbc/pom.xml

@@ -59,7 +59,7 @@
         <sqlite-jdbc.version>3.41.2.2</sqlite-jdbc.version>
         <oracle.jdbc.driver.version>19.7.0.0</oracle.jdbc.driver.version>
         <mssqlserver.jdbc.driver.version>8.4.1.jre8</mssqlserver.jdbc.driver.version>
-        <postgresql.version>42.3.3</postgresql.version>
+        <postgresql.version>42.3.9</postgresql.version>
         <jtds.driver.version>1.3.1</jtds.driver.version>
         <openmldb-jdbc.version>0.8.5</openmldb-jdbc.version>
         <licenses.name>Confluent Community License</licenses.name>