Bump org.postgresql:postgresql from 42.7.8 to 42.7.9

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.8 to 42.7.9.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.8...REL42.7.9)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ kotlin = "2.3.0"
 kotlinx-kover = "0.9.4"
 kotlin-serialization = "1.9.0"
 ktor = "3.3.2"
-postgresql = "42.7.8"
+postgresql = "42.7.9"
 progressbar = "0.10.2"
 sendgrid = "4.10.3"