Bump regex from 1.9.5 to 1.9.6 (#2168)

Bumps [regex](https://github.com/rust-lang/regex) from 1.9.5 to 1.9.6.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/rust-lang/regex/blob/master/CHANGELOG.md">regex's
changelog</a>.</em></p>
<blockquote>
<h1>1.9.6 (2023-09-30)</h1>
<p>This is a patch release that fixes a panic that can occur when the
default
regex size limit is increased to a large number.</p>
<ul>
<li><a
href="https://github.com/rust-lang/regex/commit/aa4e4c7120b0090ce0624e3c42a2ed06dd8b918a">BUG
aa4e4c71</a>:
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.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/regex/commit/11b44439786499014f61afe6e294650fb01550be"><code>11b4443</code></a>
1.9.6</li>
<li><a
href="https://github.com/rust-lang/regex/commit/3dda4255e11ddb9257f6b75135bb2f3f8a554acb"><code>3dda425</code></a>
deps: bump regex-automata to 0.3.9</li>
<li><a
href="https://github.com/rust-lang/regex/commit/03f00bd756d85ee21714136e46836c4a5ad1b99c"><code>03f00bd</code></a>
regex-automata-0.3.9</li>
<li><a
href="https://github.com/rust-lang/regex/commit/e4674083346283cdf24fdc211dc44a4a6f6846b1"><code>e467408</code></a>
changelog: 1.9.6</li>
<li><a
href="https://github.com/rust-lang/regex/commit/aa4e4c7120b0090ce0624e3c42a2ed06dd8b918a"><code>aa4e4c7</code></a>
automata: fix unintended panic in max_haystack_len</li>
<li><a
href="https://github.com/rust-lang/regex/commit/27a25385c0bd1228716271668febc88bd8c74932"><code>27a2538</code></a>
automata: add some #[inline] annotations</li>
<li><a
href="https://github.com/rust-lang/regex/commit/061ee815ef2c44101dba7b0b124600fcb03c1912"><code>061ee81</code></a>
readme: visually emphasize performance criteria difference</li>
<li><a
href="https://github.com/rust-lang/regex/commit/8275c1b3bef014a4393d9975285757f89d7e4592"><code>8275c1b</code></a>
doc: fix a few typos</li>
<li><a
href="https://github.com/rust-lang/regex/commit/cdc0dbd3547462aedb6235197c2b743ec4ea75e5"><code>cdc0dbd</code></a>
readme: add section about performance and benchmarks</li>
<li><a
href="https://github.com/rust-lang/regex/commit/4aaf3896ef1147000a5e63f174fa49bfa5d18d65"><code>4aaf389</code></a>
ci: pin to memchr 2.6.2 for MSRV CI job</li>
<li>See full diff in <a
href="https://github.com/rust-lang/regex/compare/1.9.5...1.9.6">compare
view</a></li>
</ul>
</details>
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