Bump postgresql from 42.4.1 to 42.4.3 in /athena-postgresql

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 to 42.4.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.4.1...REL42.4.3)

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

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

athena-postgresql/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.4.1</version>
+            <version>42.4.3</version>
         </dependency>
         <!-- https://mvnrepository.com/artifact/com.amazonaws/aws-java-sdk-rds -->
         <dependency>