Bump regex from 1.5.4 to 1.5.6 (#7)

Bump regex from 1.5.4 to 1.5.6

Bumps regex from 1.5.4 to 1.5.6.

Changelog
Sourced from regex's changelog.

1.5.6 (2022-05-20)
This release includes a few bug fixes, including a bug that produced incorrect
matches when a non-greedy ? operator was used.

[BUG #680](rust-lang/regex#680):
Fixes a bug where [[:alnum:][:^ascii:]] dropped [:alnum:] from the class.
[BUG #859](rust-lang/regex#859):
Fixes a bug where Hir::is_match_empty returned false for \b.
[BUG #862](rust-lang/regex#862):
Fixes a bug where 'ab??' matches 'ab' instead of 'a' in 'ab'.

1.5.5 (2022-03-08)
This releases fixes a security bug in the regex compiler. This bug permits a
vector for a denial-of-service attack in cases where the regex being compiled
is untrusted. There are no known problems where the regex is itself trusted,
including in cases of untrusted haystacks.

SECURITY #GHSA-m5pq-gvj9-9vr8:
Fixes a bug in the regex compiler where empty sub-expressions subverted the
existing mitigations in place to enforce a size limit on compiled regexes.
The Rust Security Response WG published an advisory about this:
https://groups.google.com/g/rustlang-security-announcements/c/NcNNL1Jq7Yw




Commits

9aef5b1 1.5.6
2931b07 syntax: bump minimum regex-syntax version to 0.6.26
b41bde0 regex-syntax-0.6.26
d98da65 changelog: 1.5.6
1c19619 syntax: fix literal extraction for 'ab??'
88a2a62 syntax: fix 'is_match_empty' predicate
72f09f1 syntax: fix ascii class union bug
b537286 doc: fix some typos
258bdf7 changelog: 1.5.5
d130381 1.5.5
Additional commits viewable in compare view




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Reviewed-by: Artem Goncharov <Artem.goncharov@gmail.com>