Update backportrc with 9.1 (#2509)

mjwolf · web-flow · commit 7b7fa155a8a6 · 2025-08-13T12:18:56.000-07:00
Update .backportrc.json with 9.1
diff --git a/.backportrc.json b/.backportrc.json
@@ -2,6 +2,7 @@
   "upstream": "elastic/ecs",
   "branches": [
     { "name": "main", "checked": true },
+    "9.1",
     "9.0",
     "8.x",
     "8.17",
