Merge upstream: Re-add mason-lspconfig

lua/kickstart/plugins/lspconfig.lua

@@ -8,6 +8,8 @@ return {
       -- Mason must be loaded before its dependents so we need to set it up here.
       -- NOTE: `opts = {}` is the same as calling `require('mason').setup({})`
       { 'mason-org/mason.nvim', opts = {} },
+      -- Maps LSP server names between nvim-lspconfig and Mason package names.
+      'mason-org/mason-lspconfig.nvim',
       'WhoIsSethDaniel/mason-tool-installer.nvim',
 
       -- Useful status updates for LSP.