Enable Renovate Unity editor updates (#8752)

renovate.json

@@ -11,7 +11,8 @@
     "custom.regex",
     "github-actions",
     "gomod",
-    "swift"
+    "swift",
+    "unity3d"
   ],
   "labels": [
     "dependencies"
@@ -32,6 +33,26 @@
         "gomod"
       ],
       "skipArtifactsUpdate": true
+    },
+    {
+      "description": "Propose stable Unity editor patch updates for manual review",
+      "matchManagers": [
+        "unity3d"
+      ],
+      "automerge": false,
+      "dependencyDashboardApproval": true,
+      "minimumReleaseAge": "7 days"
+    },
+    {
+      "description": "Keep Unity editor upgrades on the current release line",
+      "matchManagers": [
+        "unity3d"
+      ],
+      "matchUpdateTypes": [
+        "major",
+        "minor"
+      ],
+      "enabled": false
     }
   ],
   "customManagers": [