Update ruby-redcarpet to 3.5.0.
Version 3.5.0
* Avoid mutating the options hash passed to a render object.
Refs #663.
Max Schwenk
* Fix a segfault rendering quotes using StripDown and the :quote option.
Fixes#639.
* Fix warning: instance variable @options not initialized when running under
verbose mode (-w, $VERBOSE = true).
* Fix SmartyPants single quotes right after a link. For example:
[John](http://john.doe)'s cat
Will now properly converts ' to a right single quote (i.e. ’).
Fixes#624.
* Remove the rel and rev attributes from the output generated for footnotes as
they don't pass the HTML 5 validation.
Fixes#536.
* Automatically enable the fenced_code_blocks option passing a HTML_TOC object
to the Markdown object's constructor since some languages rely on the sharp
to comment code.
Fixes#451.
* Allow passing Range objects to the nesting_level option to have a higher
level of customization for table of contents:
Redcarpet::Render::HTML_TOC.new(nesting_level: 2..5)
Fixes#519.