Use get_node_at_position from Neovim 0.8 if available

lua/orgmode/utils/treesitter.lua

@@ -12,11 +12,21 @@ end
 ---@param winnr? number
 ---@param ignore_injected_langs? boolean
 function M.get_node_at_cursor(cursor, winnr, ignore_injected_langs)
+  if not cursor then
+    return ts_utils.get_node_at_cursor(winnr, ignore_injected_langs)
+  end
+
   winnr = winnr or 0
-  cursor = cursor or vim.api.nvim_win_get_cursor(winnr)
+  local buf = vim.api.nvim_win_get_buf(winnr)
+  -- TODO: Use only this function when 0.8 is released
+  if vim.treesitter.get_node_at_position then
+    return vim.treesitter.get_node_at_position(buf, cursor[1] - 1, cursor[2], {
+      ignore_injections = ignore_injected_langs,
+    })
+  end
+
   local cursor_range = { cursor[1] - 1, cursor[2] }
 
-  local buf = vim.api.nvim_win_get_buf(winnr)
   local root_lang_tree = parsers.get_parser(buf)
   if not root_lang_tree then
     return