update downstream branch

ci.jsonnet

@@ -246,13 +246,13 @@ local contains(str, needle) = std.findSubstr(needle, str) != [];
     # Downstream Graal branch to test against. If you change this value to anything but
     # "master", you must create an ol-jira issue to change it back to master once the
     # next JVMCI release has been made. Add the issue id as a comment here.
-    local downstream_branch = "release/graal-vm/24.0",
+    local downstream_branch = "cpu/graal-vm/24.0",
 
     local clone_graal(defs) = {
         # Checkout the graal-enterprise repo to the "_gate" version of the
         # named downstream branch. This ensures the graal-enterprise and
         # graal repos will be in sync.
-        local branch = if downstream_branch == "release/graal-vm/24.0" then "release/graal-vm/24.0" else downstream_branch + "_gate",
+        local branch = if downstream_branch == "cpu/graal-vm/24.0" then "cpu/graal-vm/24.0" else downstream_branch + "_gate",
 
         run+: [
             ["git", "clone", defs.graal_enterprise_url],