Bump org.testcontainers:testcontainers from 1.20.5 to 1.20.6

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.5 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@1.20.5...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]>

Author: dependabot[bot]

smoke-tests/framework/build.gradle.kts

@@ -22,7 +22,7 @@ dependencies {
   implementation("io.opentelemetry.proto:opentelemetry-proto:1.5.0-alpha")
 
   // this is exposed in SmokeTestExtension API
-  api("org.testcontainers:testcontainers:1.20.5")
+  api("org.testcontainers:testcontainers:1.20.6")
 
   implementation("org.awaitility:awaitility:4.3.0")