fix: indentation

Add auto-merge configuration for backport PRs. Any source PR with the `automerge-backports` label will automatically have auto merge enabled on the backports created by @Mergifyio

.mergify.yml

@@ -92,3 +92,14 @@ pull_request_rules:
           {{ title }} (#{{ number }})
 
           {{ body }}
+
+  - name: Auto-merge eligible backport PRs
+    conditions:
+      - author=mergify[bot]
+      - base~=^version-(15|16)-hotfix$
+      - backport_of.label=automerge-backports
+      - check-success=*
+    actions:
+      merge:
+        method: squash
+        commit_message: title+body