deps(upgrade): bump org.testcontainers:testcontainers from 1.20.4 to 1.20.6 (#886)

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.4 to 1.20.6.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.4...1.20.6)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  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>

Author: dependabot[bot]

build.gradle.kts

@@ -106,7 +106,7 @@ dependencies {
     testImplementation("org.mockito:mockito-core:4.11.0")
     testImplementation("org.mockito:mockito-inline:4.11.0")
     testImplementation("org.mockito:mockito-junit-jupiter:4.11.0")
-    testImplementation("org.testcontainers:testcontainers:1.20.4")
+    testImplementation("org.testcontainers:testcontainers:1.20.6")
     testImplementation("org.assertj:assertj-core:3.27.3")
 }