Bump org.testcontainers:testcontainers-bom from 1.19.1 to 1.19.4

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.19.1 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](testcontainers/testcontainers-java@1.19.1...1.19.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

externalized-properties-database/build.gradle.kts

@@ -31,7 +31,7 @@ testing {
         implementation(testFixtures(project(project.path)))
         implementation(project(":externalized-properties-core"))
         implementation(testFixtures(project(":externalized-properties-core")))
-        implementation(project.dependencies.platform("org.testcontainers:testcontainers-bom:1.19.1"))
+        implementation(project.dependencies.platform("org.testcontainers:testcontainers-bom:1.19.4"))
         implementation("org.testcontainers:junit-jupiter")
         implementation("org.testcontainers:postgresql")
         implementation("org.testcontainers:mysql")