Update regex-syntax to support new word boundry assertions

From the regex v1.10.0 release notes [1]:

    This is a new minor release of regex that adds support for start
    and end word boundary assertions. [...]

    The new word boundary assertions are:

        • \< or \b{start}: a Unicode start-of-word boundary (\W|\A
          on the left, \w on the right).
        • \> or \b{end}: a Unicode end-of-word boundary (\w on the
          left, \W|\z on the right)).
        • \b{start-half}: half of a Unicode start-of-word boundary
          (\W|\A on the left).
        • \b{end-half}: half of a Unicode end-of-word boundary
          (\W|\z on the right).

[1]: https://github.com/rust-lang/regex/blob/master/CHANGELOG.md#1100-2023-10-09

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