Update renovate.json for schedule updates

Author: MohammadiIram

.github/renovate.json

@@ -28,7 +28,7 @@
       },
       {
         "matchManagers": ["tekton"],
-        "matchBaseBranches": ["rhoai-2.18"],
+        "matchBaseBranches": ["rhoai-2.16", "rhoai-2.13", "rhoai-2.18", "rhoai-2.8"],
         "matchUpdateTypes": ["digest", "minor"],
         "enabled": true,
         "groupName": "Tekton Updates",
@@ -45,6 +45,11 @@
         "matchBaseBranches": ["rhoai-2.17"],
         "enabled": false
       },
+      {
+        "matchManagers": ["tekton"],
+        "matchBaseBranches": ["rhoai-2.19"],
+        "schedule": ["monthly"],
+        "enabled": true
       {
         "matchManagers": ["rpm"],
         "matchBaseBranches": ["main", "rhoai-2.16", "rhoai-2.13", "rhoai-2.18", "rhoai-2.19", "rhoai-2.8"],