Keep Gradle versions API URL on services.gradle.org

The /versions/all endpoint does not exist on downloads.gradle.org
(returns 404), so GRADLE_VERSIONS_ALL_URL must remain on
services.gradle.org while distribution URLs use downloads.gradle.org.

Author: timtebeek

rewrite-gradle/src/main/java/org/openrewrite/gradle/util/GradleWrapper.java

@@ -56,7 +56,7 @@ public class GradleWrapper {
     @Deprecated
     private static final String GRADLE_SERVICES_URL = "https://services.gradle.org";
     private static final String GRADLE_DISTRIBUTIONS_URL = GRADLE_DOWNLOADS_URL + "/distributions";
-    private static final String GRADLE_VERSIONS_ALL_URL = GRADLE_DOWNLOADS_URL + "/versions/all";
+    private static final String GRADLE_VERSIONS_ALL_URL = GRADLE_SERVICES_URL + "/versions/all";
     public static final String WRAPPER_JAR_LOCATION_RELATIVE_PATH = "gradle/wrapper/gradle-wrapper.jar";
     public static final String WRAPPER_PROPERTIES_LOCATION_RELATIVE_PATH = "gradle/wrapper/gradle-wrapper.properties";
     public static final String WRAPPER_SCRIPT_LOCATION_RELATIVE_PATH = "gradlew";