chore(gradle): bump testcontainers from 1.20.0 to 1.20.3 (#6283)

Bumps `testcontainers` from 1.20.0 to 1.20.3.

Updates `org.testcontainers:testcontainers` from 1.20.0 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@1.20.0...1.20.3)

Updates `org.testcontainers:junit-jupiter` from 1.20.0 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@1.20.0...1.20.3)

Updates `org.testcontainers:localstack` from 1.20.0 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@1.20.0...1.20.3)

Updates `org.testcontainers:minio` from 1.20.0 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@1.20.0...1.20.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  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
- dependency-name: org.testcontainers:localstack
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.testcontainers:minio
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -87,7 +87,7 @@ h2database = "2.3.232"
 jmock = "2.13.1"
 junit = "5.11.3"
 junit4 = "4.13.2"
-testcontainers = "1.20.0"
+testcontainers = "1.20.3"
 jmh = "1.37"
 spockframework = "2.3-groovy-3.0"