Use official ubi9-minimal base image for es docker (#126280) (#126283)

Based on feedback we got here: Based on feedback we got
https://github.com/docker-library/official-images/pull/18692\#issuecomment-2749045229
we can not rely on non official images here

Author: breskeby

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/DockerBase.java

@@ -14,7 +14,7 @@
  */
 public enum DockerBase {
     // "latest" here is intentional, since the image name specifies "9"
-    DEFAULT("docker.elastic.co/ubi9/ubi-minimal:latest", "", "microdnf"),
+    DEFAULT("redhat/ubi9-minimal:latest", "", "microdnf"),
 
     // The Iron Bank base image is UBI (albeit hardened), but we are required to parameterize the Docker build
     IRON_BANK("${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG}", "-ironbank", "yum"),