Bump org.postgresql:postgresql from 42.7.4 to 42.7.7 in /kotlin-testing

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.4 to 42.7.7.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.4...REL42.7.7)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-version: 42.7.7
  dependency-type: direct:production
...

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

Author: dependabot[bot]

kotlin-testing/pom.xml

@@ -131,7 +131,7 @@
         <kotest.version>5.9.1</kotest.version>
         <kotest-testcontainers.version>2.0.2</kotest-testcontainers.version>
         <testcontainers.version>1.20.1</testcontainers.version>
-        <postgresql.version>42.7.4</postgresql.version>
+        <postgresql.version>42.7.7</postgresql.version>
         <mockk.version>1.12.0</mockk.version>
         <kluent.version>1.73</kluent.version>
     </properties>