Revert "Add missing jaxb dependency for EhCache3 smoke test"

This revert a7f06e0 as the version of EhCache already depends on JAXB.

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-cache/build.gradle

@@ -37,9 +37,6 @@ dependencies {
 	ehcache(enforcedPlatform(project(":spring-boot-project:spring-boot-dependencies")))
 	ehcache("javax.cache:cache-api")
 	ehcache("org.ehcache:ehcache")
-	if (JavaVersion.current().java11Compatible) {
-		ehcache("org.glassfish.jaxb:jaxb-runtime")
-	}
 	ehcache2(enforcedPlatform(project(":spring-boot-project:spring-boot-dependencies")))
 	ehcache2("net.sf.ehcache:ehcache")