Bump org.testcontainers:postgresql from 1.20.2 to 1.20.3

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.20.2 to 1.20.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.2...1.20.3)

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

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

pom.xml

@@ -20,7 +20,7 @@
         <exec.mainClass>no.javatec.demo.ApplicationKt</exec.mainClass>
 
         <micronaut.runtime>netty</micronaut.runtime>
-        <testcontainers.version>1.20.2</testcontainers.version>
+        <testcontainers.version>1.20.3</testcontainers.version>
         <kotlinVersion>2.0.21</kotlinVersion>
     </properties>