fix: vim.diagnostic.is_disabled() deprecation warning (#907)

This requires Neovim 0.10.0.

lua/bufferline/diagnostics.lua

@@ -71,8 +71,7 @@ local get_diagnostics = {
     local results = {}
     local diagnostics = vim.diagnostic.get()
     for _, d in pairs(diagnostics) do
-      -- TODO remove is_disabled nil check when 0.9 is stable
-      if vim.diagnostic.is_disabled == nil or not vim.diagnostic.is_disabled(d.bufnr, d.namespace) then
+      if vim.diagnostic.is_enabled({ ns_id = d.namespace, bufnr = d.bufnr }) then
         if not results[d.bufnr] then results[d.bufnr] = {} end
         table.insert(results[d.bufnr], d)
       end