Bump org.postgresql:postgresql from 42.3.7 to 42.3.9

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.7 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@REL42.3.7...REL42.3.9)

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

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

pom.xml

@@ -18,7 +18,7 @@
     <waffle.version>2.2.1</waffle.version>
     <jna.version>5.5.0</jna.version>
     <hibernate.version>5.4.2.Final</hibernate.version>
-    <postgresql.version>42.3.7</postgresql.version>
+    <postgresql.version>42.3.9</postgresql.version>
     <bouncycastle.version>1.69</bouncycastle.version>
     <shiro.version>1.12.0</shiro.version>
     <dom4j.version>2.1.3</dom4j.version>