Bump org.testcontainers:testcontainers-bom from 1.20.1 to 1.20.6

Bumps [org.testcontainers:testcontainers-bom](https://github.com/testcontainers/testcontainers-java) from 1.20.1 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@1.20.1...1.20.6)

---
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]>

Author: dependabot[bot]

build.gradle

@@ -27,7 +27,7 @@ ext {
     awsSdkVersion = "2.30.8"
     springBootVersion = "3.4.2"
     edisonVersion = "3.4.2"
-    testcontainersVersion = "1.20.1"
+    testcontainersVersion = "1.20.6"
 }