Bump org.testcontainers:testcontainers-bom from 1.19.8 to 1.20.3

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.19.8 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@1.19.8...1.20.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -33,7 +33,7 @@
     <maven.compiler.target>${java.version}</maven.compiler.target>
     <maven.compiler.source>${java.version}</maven.compiler.source>
     <wiremock.version>3.5.4</wiremock.version>
-    <testcontainers.version>1.19.8</testcontainers.version>
+    <testcontainers.version>1.20.3</testcontainers.version>
     <junit.version>5.10.2</junit.version>
     <assertj.version>3.26.3</assertj.version>
     <awaitility.version>4.2.2</awaitility.version>