Update renovate.json to add package rule for stability

renovate.json

@@ -7,5 +7,11 @@
     ":disableMajorUpdates",
     "customManagers:dockerfileVersions"
   ],
-  "forkProcessing": "enabled"
+  "forkProcessing": "enabled",
+  "packageRules": [
+    {
+      "matchPackagePatterns": ["*"],
+      "stabilityDays": 7
+    }
+  ]
 }