Bump org.testcontainers:testcontainers-bom from 1.18.1 to 1.18.3 (#118)

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.18.1 to 1.18.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.18.1...1.18.3)

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

externalized-properties-database/build.gradle

@@ -26,7 +26,7 @@ testing {
         implementation project.dependencies.testFixtures(project(":externalized-properties-core"))
         // Fix when https://github.com/gradle/gradle/issues/19065 is resolved.
         // Update: To be fixed in Gradle 7.6.
-        implementation project.dependencies.platform("org.testcontainers:testcontainers-bom:1.18.1")
+        implementation project.dependencies.platform("org.testcontainers:testcontainers-bom:1.18.3")
         implementation "org.testcontainers:junit-jupiter"
         implementation "org.testcontainers:postgresql"
         implementation "org.testcontainers:mysql"