Bump testcontainers from 1.20.4 to 1.20.6

Bumps `testcontainers` from 1.20.4 to 1.20.6.

Updates `org.testcontainers:testcontainers` from 1.20.4 to 1.20.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.4...1.20.6)

Updates `org.testcontainers:kafka` from 1.20.4 to 1.20.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.4...1.20.6)

Updates `org.testcontainers:junit-jupiter` from 1.20.4 to 1.20.6
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.4...1.20.6)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.testcontainers:kafka
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.testcontainers:junit-jupiter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -24,7 +24,7 @@ cel = '0.3.0'
 junit = '5.11.2'
 mockito = '5.14.2'
 okhttp3 = '4.12.0'
-testcontainers = '1.20.4'
+testcontainers = '1.20.6'
 swagger-integration-jakarta = '2.2.8'
 jakarta-annotation-api = '2.1.1'
 jackson-databind-nullable = '0.2.6'