Update regex-syntax requirement from 0.7.1 to 0.8.0

[dependabot]

Updates the requirements on regex-syntax to permit the latest version.

Changelog

Sourced from regex-syntax's changelog.

1.10.0 (2023-10-09)

This is a new minor release of regex that adds support for start and end word boundary assertions. That is, \< and \>. The minimum supported Rust version has also been raised to 1.65, which was released about one year ago.

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).

The \< and \> are GNU extensions to POSIX regexes. They have been added to the regex crate because they enjoy somewhat broad support in other regex engines as well (for example, vim). The \b{start} and \b{end} assertions are aliases for \< and \>, respectively.

The \b{start-half} and \b{end-half} assertions are not found in any other regex engine (although regex engines with general look-around support can certainly express them). They were added principally to support the implementation of word matching in grep programs, where one generally wants to be a bit more flexible in what is considered a word boundary.

New features:

• [FEATURE #469](rust-lang/regex#469): Add support for \< and \> word boundary assertions.
• [FEATURE(regex-automata) #1031](rust-lang/regex#1031): DFAs now have a start_state method that doesn't use an Input.

Performance improvements:

• [PERF #1051](rust-lang/regex#1051): Unicode character class operations have been optimized in regex-syntax.
• [PERF #1090](rust-lang/regex#1090): Make patterns containing lots of literal characters use less memory.

Bug fixes:

• [BUG #1046](rust-lang/regex#1046): Fix a bug that could result in incorrect match spans when using a Unicode word boundary and searching non-ASCII strings.
• [BUG(regex-syntax) #1047](rust-lang/regex#1047): Fix panics that can occur in Ast->Hir translation (not reachable from regex crate).

... (truncated)

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