Support windows-style newlines in parser

### What is wrong?

The parser doesn't account for the possibility of a carriage return `\r` prior to a newline `\n`, and so it'll reject windows-style CRLF newlines.

### How can it be fixed

Probably just need to update the newline regex in `crates/parser/src/lexer/token.rs` to allow for an optional `\r` (but I may be forgetting something).

Start in crates/parser/src/lexer/token.rs and inspect the newline-matching regex used by the lexer. Verify the parser's newline handling with Windows-style CRLF input, and consider the issue complete when such input is accepted without breaking existing newline handling.

Written by the indexing model from the issue text.