Bump org.postgresql:postgresql from 42.6.0 to 42.7.4 (#48)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.6.0 to 42.7.4.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.6.0...REL42.7.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ jupiter = "5.11.0"
 kotest = "5.9.1"
 mockk = "1.13.12"
 testContainers = "1.20.1"
-postgresql = "42.6.0"
+postgresql = "42.7.4"
 h2 = "2.2.220"
 
 [libraries]