Bump testContainersVersion from 1.19.3 to 1.19.4 in /Plan (#3431)

Bumps `testContainersVersion` from 1.19.3 to 1.19.4.

Updates `org.testcontainers:testcontainers` from 1.19.3 to 1.19.4
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.19.3...1.19.4)

Updates `org.testcontainers:junit-jupiter` from 1.19.3 to 1.19.4
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.19.3...1.19.4)

Updates `org.testcontainers:nginx` from 1.19.3 to 1.19.4
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-java/compare/1.19.3...1.19.4)

---
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:nginx
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Plan/build.gradle

@@ -107,7 +107,7 @@ subprojects {
 
         junitVersion = "5.10.1"
         mockitoVersion = "5.10.0"
-        testContainersVersion = "1.19.3"
+        testContainersVersion = "1.19.4"
         swaggerVersion = "2.2.20"
     }