Update Rust crate regex to 1.9.6

[renovate]

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

Compare Source

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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:
  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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