Revert "Remove 8.17 from branches.json"

This reverts commit afa7fec99c517632016fd99d9c0ccc56df276518.

branches.json

@@ -16,6 +16,9 @@
     {
       "branch": "8.18"
     },
+    {
+      "branch": "8.17"
+    },
     {
       "branch": "7.17"
     }