build(deps): bump org.postgresql:postgresql from 42.6.0 to 42.7.3

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.6.0 to 42.7.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.6.0...REL42.7.3)

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

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

gradle/libs.versions.toml

@@ -10,7 +10,7 @@ jackson = "2.14.2"
 jupiter = "5.10.1"
 mockserver = "5.15.0"
 nimbus = "9.37"
-postgres = "42.6.0"
+postgres = "42.7.3"
 restAssured = "5.3.2"
 swagger = "2.2.18"
 rsApi = "3.1.0"