fix(tests): set up lazy.nvim in the lsp test (#4088)

lua/lvim/lsp/utils.lua

@@ -55,6 +55,7 @@ end
 ---@param filter { filetype: string | string[] }?: (optional) Used to filter the list of server names.
 ---@return string[] list of names of supported servers
 function M.get_supported_servers(filter)
+  require("mason-registry").refresh()
   local _, supported_servers = pcall(function()
     return require("mason-lspconfig").get_available_servers(filter)
   end)