Polish Paketo builder integration test native app

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-nativeApp.gradle

@@ -34,10 +34,5 @@ bootJar {
 }
 
 bootBuildImage {
-	builder = 'paketobuildpacks/builder:tiny'
 	environment = ['BP_NATIVE_IMAGE': 'true']
-	buildpacks = [
-			"gcr.io/paketo-buildpacks/bellsoft-liberica:9.9.0-ea",
-			"urn:cnb:builder:paketo-buildpacks/java-native-image"
-	]
 }