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Disable ropey unicode_lines feature (#50)

With the current configuration, Ropey recognises more EOL sequences than the Language Server Protocol. This mismatch can lead to errors when trying to maintain a mirror of the user's documents as the llm-ls might have more lines.

See: https://docs.rs/ropey/1.6.0/ropey/index.html#a-note-about-line-breaks
See: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocuments