build(deps): bump postgresql from 42.5.1 to 42.6.0

Bumps [postgresql](https://github.com/pgjdbc/pgjdbc) from 42.5.1 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@REL42.5.1...REL42.6.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -103,7 +103,7 @@
   <org.hibernate.hibernate.version>5.6.14.Final</org.hibernate.hibernate.version>
   <com.vladmihalcea.hibernate.types.version>2.21.1</com.vladmihalcea.hibernate.types.version>
   <com.h2database.h2.version>2.1.214</com.h2database.h2.version>
-  <org.postgresql.postgresql.version>42.5.1</org.postgresql.postgresql.version>
+  <org.postgresql.postgresql.version>42.6.0</org.postgresql.postgresql.version>
 
   <com.github.spotbugs.version>4.7.3</com.github.spotbugs.version>
   <com.github.spotbugs.plugin.version>4.7.3.3</com.github.spotbugs.plugin.version>