break: bump the minimum required neovim version to 0.6 or higher (#1549)

So we can use `vim.json` and `vim.diagnostics`.

If you aren't able to update to 0.6.* yet you should pin the previous commit.

lua/telescope/builtin/init.lua

@@ -26,8 +26,8 @@
 --- </code>
 ---@brief ]]
 
-if 1 ~= vim.fn.has "nvim-0.5.1" then
-  vim.api.nvim_err_writeln "This plugins requires neovim 0.5.1"
+if 1 ~= vim.fn.has "nvim-0.6.0" then
+  vim.api.nvim_err_writeln "This plugins requires neovim 0.6.0"
   vim.api.nvim_err_writeln "Please update your neovim."
   return
 end

lua/telescope/builtin/internal.lua

@@ -245,7 +245,7 @@ internal.symbols = function(opts)
 
   local results = {}
   for _, source in ipairs(sources) do
-    local data = vim.fn.json_decode(Path:new(source):read())
+    local data = vim.json.decode(Path:new(source):read())
     for _, entry in ipairs(data) do
       table.insert(results, entry)
     end

lua/telescope/builtin/lsp.lua

@@ -380,16 +380,10 @@ local function get_workspace_symbols_requester(bufnr, opts)
     _, cancel = vim.lsp.buf_request(bufnr, "workspace/symbol", { query = prompt }, tx)
 
     -- Handle 0.5 / 0.5.1 handler situation
-    local err, res_1, res_2 = rx()
-    local results_lsp
-    if type(res_1) == "table" then
-      results_lsp = res_1
-    else
-      results_lsp = res_2
-    end
+    local err, res = rx()
     assert(not err, err)
 
-    local locations = vim.lsp.util.symbols_to_items(results_lsp or {}, bufnr) or {}
+    local locations = vim.lsp.util.symbols_to_items(res or {}, bufnr) or {}
     if not vim.tbl_isempty(locations) then
       locations = utils.filter_symbols(locations, opts) or {}
     end