build(deps-dev): Bump org.testcontainers:testcontainers

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.6 to 1.21.0.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.6...1.21.0)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-version: 1.21.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -38,7 +38,7 @@
         <org.mockito.version>5.17.0</org.mockito.version>
         <org.slf4j.version>2.0.17</org.slf4j.version>
         <org.skyscreamer.version>1.5.3</org.skyscreamer.version>
-        <org.testcontainers.version>1.20.6</org.testcontainers.version>
+        <org.testcontainers.version>1.21.0</org.testcontainers.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     </properties>