Update testcontainers-java monorepo to v1.20.6 (#8687)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ org-jetbrains-kotlin = "2.1.0"
 org-junit-jupiter = "5.11.4"
 retrofit = "2.11.0"
 startupRuntime = "1.2.0"
-testcontainers = "1.20.5"
+testcontainers = "1.20.6"
 
 [libraries]
 amazonCorretto = "software.amazon.cryptools:AmazonCorrettoCryptoProvider:2.4.1"