Bump org.testcontainers:postgresql from 1.20.4 to 1.21.3

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.20.4 to 1.21.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.4...1.21.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:postgresql
  dependency-version: 1.21.3
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -108,7 +108,7 @@
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>postgresql</artifactId>
-            <version>1.20.4</version>
+            <version>1.21.3</version>
             <scope>test</scope>
         </dependency>
         <dependency>