Bump version.testcontainers from 1.20.0 to 1.20.3

Bumps `version.testcontainers` from 1.20.0 to 1.20.3.

Updates `org.testcontainers:db2` from 1.20.0 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](https://github.com/testcontainers/testcontainers-java/compare/1.20.0...1.20.3)

Updates `org.testcontainers:oracle-xe` from 1.20.0 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](https://github.com/testcontainers/testcontainers-java/compare/1.20.0...1.20.3)

Updates `org.testcontainers:postgresql` from 1.20.0 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](https://github.com/testcontainers/testcontainers-java/compare/1.20.0...1.20.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:db2
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.testcontainers:oracle-xe
  dependency-type: direct:production
  update-type: version-update:semver-patch
- 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

@@ -87,7 +87,7 @@
     <version.openpojo>0.9.1</version.openpojo>
     <version.jacoco>0.8.12</version.jacoco>
     <version.slf4j-test>3.0.1</version.slf4j-test>
-    <version.testcontainers>1.20.0</version.testcontainers>
+    <version.testcontainers>1.20.3</version.testcontainers>
     <version.spring-openapi>2.6.0</version.spring-openapi>
 
     <!-- AspectJ dependencies -->