Rollback to deprecated "logrotate" JJB option

sre-ci dislikes new parameter

Change-Id: I124e1b125343b02f167f9ea6b768e6b5f9492847
diff --git a/jobs/templates/release-artifact-checker.yml b/jobs/templates/release-artifact-checker.yml
index 1b9cd07..9462e15 100644
--- a/jobs/templates/release-artifact-checker.yml
+++ b/jobs/templates/release-artifact-checker.yml
@@ -9,6 +9,6 @@
     builders:
     - shell:
         "python3 jobs/scripts/mcp_mu_release_artifact_checker.py"
-    build-discarder:
-      days-to-keep: 365
-      artifact-days-to-keep: 60
+    logrotate:
+      DaysToKeep: 365
+      artifactDaysToKeep: 60