chore(deps): bump org.testcontainers:postgresql from 1.20.3 to 1.20.4

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.20.3 to 1.20.4.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.3...1.20.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

wrapper/build.gradle.kts

@@ -71,7 +71,7 @@ dependencies {
     testImplementation("software.amazon.awssdk:sts:2.29.34")
     testImplementation("org.testcontainers:testcontainers:1.20.1")
     testImplementation("org.testcontainers:mysql:1.20.1")
-    testImplementation("org.testcontainers:postgresql:1.20.3")
+    testImplementation("org.testcontainers:postgresql:1.20.4")
     testImplementation("org.testcontainers:mariadb:1.20.4")
     testImplementation("org.testcontainers:junit-jupiter:1.20.1")
     testImplementation("org.testcontainers:toxiproxy:1.20.4")