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]>

externalized-properties-database/build.gradle.kts

@@ -40,7 +40,7 @@ testing {
         implementation("org.testcontainers:mariadb")
         implementation("org.testcontainers:db2")
         implementation("com.zaxxer:HikariCP:5.1.0")
-        runtimeOnly("org.postgresql:postgresql:42.6.0")
+        runtimeOnly("org.postgresql:postgresql:42.7.3")
         runtimeOnly("mysql:mysql-connector-java:8.0.33")
         runtimeOnly("com.oracle.database.jdbc:ojdbc8:23.3.0.23.09")
         runtimeOnly("com.microsoft.sqlserver:mssql-jdbc:12.4.2.jre11")