Correct Mintmaker's configuration for rpm lockfile (redhat-appstudio#3896)

The correct manager for the rpm lockfile in Mintmaker is rpm.

Signed-off-by: Giulia Naponiello <[email protected]>

Author: gnaponie

components/mintmaker/base/renovate-config.yaml

@@ -10,7 +10,7 @@ data:
       "requireConfig": "optional",
       "platformCommit": true,
       "autodiscover": false,
-      "enabledManagers": ["tekton", "dockerfile", "lockFileMaintenance"],
+      "enabledManagers": ["tekton", "dockerfile", "rpm"],
       "tekton": {
         "fileMatch": ["\\.yaml$","\\.yml$"],
         "includePaths": [".tekton/**"],