build(deps-dev): bump org.postgresql:postgresql in /webtau-testapp (#1583)

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:development
...

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webtau-testapp/pom.xml

@@ -172,7 +172,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.3.8</version>
+            <version>42.3.9</version>
             <scope>test</scope>
         </dependency>
     </dependencies>