use dev branch for ui/base46 plugins

this is temporary, gets easy to test dev changes locally

lua/core/default_config.lua

@@ -5,7 +5,7 @@ local M = {}
 M.options = {
   nvChad = {
     update_url = "https://github.com/NvChad/NvChad",
-    update_branch = "main",
+    update_branch = "dev",
   },
 }