Auto merge of #4087 - Turbo87:backend-labels, r=locks

renovate: Add `A-backend` to Rust PRs

... similar to what we do for JS PRs already.

Author: bors

.github/renovate.json

@@ -14,7 +14,8 @@
         "reviewersSampleSize": 1
     },
     "rust": {
-        "dependencyDashboardApproval": true
+        "dependencyDashboardApproval": true,
+        "labels": ["A-backend"]
     },
     "postUpdateOptions": ["yarnDedupeFewer"],
     "packageRules": [{