distros: use RHEL images from Docker Hub

Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
(cherry picked from commit b265a8b)
Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>

Author: vvoland

distros.json

@@ -116,7 +116,7 @@
         "end_of_support": "01-2026"
     },
     "rhel-8": {
-        "image": "registry.access.redhat.com/ubi8/ubi",
+        "image": "redhat/ubi8",
         "arches": [
             "amd64",
             "aarch64"
@@ -126,7 +126,7 @@
         "end_of_support": "05-2024"
     },
     "rhel-9": {
-        "image": "registry.access.redhat.com/ubi9/ubi",
+        "image": "redhat/ubi9",
         "arches": [
             "amd64",
             "aarch64"
@@ -136,7 +136,7 @@
         "end_of_support": "05-2027"
     },
     "rhel-10": {
-        "image": "registry.access.redhat.com/ubi10/ubi",
+        "image": "redhat/ubi10",
         "arches": [
             "amd64",
             "aarch64"