fix usage of sedlex and upgrade to sedlex 3.5

[hhugo]

The upcoming release of sedlex (https://github.com/ocaml/opam-repository/pull/27959) revealed a bug in styled-ppx. Utf8 literals in sedlex patterns was previously not working. The non_ascii pattern also triggered a compile time error with sedlex 3.5. Its definition was suspicious and I attempted to fix it according to the spec.

See the opam release https://github.com/ocaml/opam-repository/pull/27959

See the sedlex PR adding support for utf8 litterals and adding more checks https://github.com/ocaml-community/sedlex/pull/127

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Name	Status	Preview	Comments	Updated (UTC)
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[davesnx]

Thanks hugo. Will merge and add a few unit tests.