build(deps): bump postgresql in /hugegraph-postgresql (#1960)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.1.4 to 42.4.1.
- [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/REL42.1.4...REL42.4.1)

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

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diff --git a/hugegraph-postgresql/pom.xml b/hugegraph-postgresql/pom.xml
index 0c7f4e6..72086ff 100644
--- a/hugegraph-postgresql/pom.xml
+++ b/hugegraph-postgresql/pom.xml
@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.postgresql</groupId>
             <artifactId>postgresql</artifactId>
-            <version>42.1.4</version>
+            <version>42.4.1</version>
         </dependency>
     </dependencies>
 </project>