Use Paketo early access buildpack in Paketo native system tests

Closes gh-32828

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

@@ -36,4 +36,8 @@ 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"
+	]
 }