Update Rust crate regex to 1.9.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
regex	dependencies	patch	1.9.5 -> 1.9.6

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Release Notes

rust-lang/regex (regex)

### [`v1.9.6`](https://togithub.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#196-2023-09-30) [Compare Source](https://togithub.com/rust-lang/regex/compare/1.9.5...1.9.6) \================== This is a patch release that fixes a panic that can occur when the default regex size limit is increased to a large number. - [BUG aa4e4c71](https://togithub.com/rust-lang/regex/commit/aa4e4c7120b0090ce0624e3c42a2ed06dd8b918a): Fix a bug where computing the maximum haystack length for the bounded backtracker could result underflow and thus provoke a panic later in a search due to a broken invariant.

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