Bump postgresql from 42.3.7 to 42.3.8 in /frameworks/Java/hserver

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.3.7 to 42.3.8.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](https://github.com/pgjdbc/pgjdbc/compare/REL42.3.7...REL42.3.8)

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

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

frameworks/Java/hserver/pom.xml

@@ -16,7 +16,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <version.hikaricp>3.3.1</version.hikaricp>
-        <version.postgres>42.3.7</version.postgres>
+        <version.postgres>42.3.8</version.postgres>
     </properties>
 
     <dependencies>