chore(deps): bump org.postgresql:postgresql from 42.4.1 to 42.6.0

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.4.1 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@REL42.4.1...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>

build.gradle

@@ -81,7 +81,7 @@ dependencies {
     testImplementation group: 'org.mariadb.jdbc', name: 'mariadb-java-client', version: '3.1.0'
     testImplementation group: 'mysql', name: 'mysql-connector-java', version: '8.0.31'
     testImplementation group: 'org.xerial', name: 'sqlite-jdbc', version: '3.39.4.0'
-    testImplementation group: 'org.postgresql', name: 'postgresql', version: '42.4.1'
+    testImplementation group: 'org.postgresql', name: 'postgresql', version: '42.6.0'
 
     testImplementation 'org.junit.jupiter:junit-jupiter:5.+'
     testImplementation "org.mockito:mockito-core:4.+"