fix(deps): update dependency org.testcontainers:spock to v1.21.1

Author: renovate[bot]

gradle/libs.versions.toml

@@ -58,7 +58,7 @@ smallrye = "6.7.3"
 spock = "2.3-groovy-4.0"
 spotbugs = "4.7.1"
 systemlambda = "1.2.1"
-testcontainers = "1.20.6"
+testcontainers = "1.21.1"
 tomlj="1.1.1"
 vertx = "4.5.14"
 wiremock = "2.33.2"