Bump org.testcontainers:postgresql in the postgresql group

Bumps the postgresql group with 1 update: [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java).


Updates `org.testcontainers:postgresql` 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
  dependency-group: postgresql
...

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

Author: dependabot[bot]

pom.xml

@@ -32,7 +32,7 @@
         <junit-jupiter.version>5.5.2</junit-jupiter.version>
         <assertj-core.version>3.13.2</assertj-core.version>
         <mockito-all.version>1.10.19</mockito-all.version>
-        <testcontainers.version>1.21.3</testcontainers.version>
+        <testcontainers.version>1.21.4</testcontainers.version>
 
         <spring-boot-starter-parent.version>3.5.7</spring-boot-starter-parent.version>
         <omni-coveragereporter-maven-plugin.version>0.4.5</omni-coveragereporter-maven-plugin.version>