Ended up using
plugins {
id 'java'
id 'org.springframework.boot' version '3.3.4'
id 'io.spring.dependency-management' version '1.1.4'
}
testImplementation "org.wiremock:wiremock-jetty12:3.10.0"
as in example
https://github.com/wiremock/wiremock-examples/tree/main/spring-boot/spring-boot-3/wiremock-jetty-12