[renovate] Update branches config

renovate.json

@@ -15,9 +15,11 @@
   ],
   "baseBranches": [
     "main",
+    "9.1",
     "9.0",
     "8.19",
     "8.18",
-    "8.17"
+    "8.17",
+    "7.17"
   ]
 }