fix(treesitter): invalidate conceal_lines marks (#33832)

Problem:  Spliced conceal_lines marks after changing the buffer text are
          left valid, concealing lines that shouldn't be.
Solution: Set the `invalidate` extmark property.
(cherry picked from commit 9274532615)

runtime/lua/vim/treesitter/highlighter.lua

@@ -380,6 +380,7 @@ local function on_line_impl(self, buf, line, on_spell, on_conceal)
           api.nvim_buf_set_extmark(buf, ns, start_row, 0, {
             end_line = end_row,
             conceal_lines = '',
+            invalidate = true,
           })
         end
       end