Add nvim-nio as dependency for nvim-dap-ui (nvim-lua#774)

It's a dependency now

Author: alosarjos

lua/kickstart/plugins/debug.lua

@@ -14,6 +14,9 @@ return {
     -- Creates a beautiful debugger UI
     'rcarriga/nvim-dap-ui',
 
+    -- Required dependency for nvim-dap-ui
+    'nvim-neotest/nvim-nio',
+
     -- Installs the debug adapters for you
     'williamboman/mason.nvim',
     'jay-babu/mason-nvim-dap.nvim',