Bump postgresql from 1.15.2 to 1.15.3

Bumps [postgresql](https://github.com/testcontainers/testcontainers-java) from 1.15.2 to 1.15.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/master/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.15.2...1.15.3)

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

pom.xml

@@ -270,7 +270,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>postgresql</artifactId>
-      <version>1.15.2</version>
+      <version>1.15.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>