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

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.6 to 1.21.4.
- [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...1.21.4)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-version: 1.21.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -114,7 +114,7 @@
         <lib.resilience4j.version>2.2.0</lib.resilience4j.version>
         <lib.swagger-parser.version>2.1.37</lib.swagger-parser.version>
         <lib.system-rules.version>1.19.0</lib.system-rules.version>
-        <lib.testcontainers.version>1.20.6</lib.testcontainers.version>
+        <lib.testcontainers.version>1.21.4</lib.testcontainers.version>
         <lib.wiremock.version>2.35.2</lib.wiremock.version>
         <lib.woodstox.version>7.0.0</lib.woodstox.version>
         <lib.junit-params.version>1.1.1</lib.junit-params.version>