Bump org.testcontainers:postgresql from 1.21.3 to 1.21.4

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.21.3 to 1.21.4.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.21.3...1.21.4)

---
updated-dependencies:
- dependency-name: org.testcontainers:postgresql
  dependency-version: 1.21.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pom.xml

@@ -191,7 +191,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>postgresql</artifactId>
-      <version>1.21.3</version>
+      <version>1.21.4</version>
       <scope>test</scope>
     </dependency>
     <!-- We use mockito-inline as it supports mocking static methods -->