Bump testcontainersVersion from 1.20.3 to 1.20.4

Bumps `testcontainersVersion` from 1.20.3 to 1.20.4.

Updates `org.testcontainers:junit-jupiter` from 1.20.3 to 1.20.4
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.3...1.20.4)

Updates `org.testcontainers:kafka` from 1.20.3 to 1.20.4
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.3...1.20.4)

---
updated-dependencies:
- dependency-name: org.testcontainers:junit-jupiter
  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
...

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

build.gradle

@@ -136,7 +136,7 @@ ext {
     slf4jVersion = "1.7.36"
     openSearchVersion = "2.16.0"
 
-    testcontainersVersion = "1.20.3"
+    testcontainersVersion = "1.20.4"
 }
 
 sourceSets {