attempt-backport: logically order nodeVersions

This is the order before a05e3b9

Try to patch first to the latest branch in a fail-fast way, even if it
does not actually fail fast at this point in time.

Author: Fishrock123

scripts/attempt-backport.js

@@ -9,9 +9,9 @@ const updatePrWithLabels = node_repo.updatePrWithLabels
 
 const enabledRepos = ['node']
 const nodeVersions = [
+  { version: 7 },
   { version: 4, lts: true },
-  { version: 6, lts: true },
-  { version: 7 }
+  { version: 6, lts: true }
 ]
 const queue = []
 let inProgress = false