build(deps): bump org.testcontainers:testcontainers-bom

Bumps [org.testcontainers:testcontainers-bom](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:testcontainers-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -62,7 +62,7 @@
         <wiremock.version>2.35.2</wiremock.version>
         <springmockk.version>4.0.2</springmockk.version>
         <opencsv.version>5.9</opencsv.version>
-        <testcontainers-bom.version>1.20.2</testcontainers-bom.version>
+        <testcontainers-bom.version>1.20.3</testcontainers-bom.version>
         <testcontainers-keycloak.version>3.2.0</testcontainers-keycloak.version>
         <flatten-maven.version>1.6.0</flatten-maven.version>
         <license-tool.version>1.1.0</license-tool.version>