Bump postgresql from 42.2.4 to 42.6.0 (#345)

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.2.4 to 42.6.0.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.2.4...REL42.6.0)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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pom.xml

@@ -332,7 +332,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.4</version>
+      <version>42.6.0</version>
     </dependency>
     <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->
     <dependency>