fix(deps): update dependency org.testcontainers:testcontainers to v1.21.1 (#663)

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>

Author: elastic-renovate-prod[bot]

gradle/libs.versions.toml

@@ -47,7 +47,7 @@ awaitility = "org.awaitility:awaitility:4.3.0"
 findbugs-jsr305 = "com.google.code.findbugs:jsr305:3.0.2"
 wiremockjre8 = "com.github.tomakehurst:wiremock-jre8:2.35.2"
 wiremock = "org.wiremock:wiremock:3.13.0"
-testcontainers = "org.testcontainers:testcontainers:1.21.0"
+testcontainers = "org.testcontainers:testcontainers:1.21.1"
 logback = "ch.qos.logback:logback-classic:1.5.18"
 jackson = "com.fasterxml.jackson.core:jackson-databind:2.19.0"
 protobuf-util = "com.google.protobuf:protobuf-java-util:3.25.7"