Update all minor dependencies to v1.21.0

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ jetbrains-annotations = "26.0.2"
 junit-jupiter = "5.11.3"
 mockserver-neolight = "1.0.14"
 shrinkwrap = "1.2.6"
-testcontainers = "1.20.6"
+testcontainers = "1.21.0"
 
 [libraries]
 assertj = { module = "org.assertj:assertj-core", version.ref = "assertj" }