Bump regex from 1.9.4 to 1.9.5 (#2133)

Bumps [regex](https://github.com/rust-lang/regex) from 1.9.4 to 1.9.5.
<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>1.9.5 (2023-09-02)</h1>
<p>This is a patch release that hopefully mostly fixes a performance bug
that
occurs when sharing a regex across multiple threads.</p>
<p>Issue <a
href="https://redirect.github.com/rust-lang/regex/issues/934">#934</a>
explains this in more detail. It is <a
href="https://docs.rs/regex/latest/regex/#sharing-a-regex-across-threads-can-result-in-contention">also
noted in the crate
documentation</a>.
The bug can appear when sharing a regex across multiple threads
simultaneously,
as might be the case when using a regex from a <code>OnceLock</code>,
<code>lazy_static</code> or
similar primitive. Usually high contention only results when using many
threads
to execute searches on small haystacks.</p>
<p>One can avoid the contention problem entirely through one of two
methods.
The first is to use lower level APIs from <code>regex-automata</code>
that require passing
state explicitly, such as <a
href="https://docs.rs/regex-automata/latest/regex_automata/meta/struct.Regex.html#method.search_with"><code>meta::Regex::search_with</code></a>.
The second is to clone a regex and send it to other threads explicitly.
This
will not use any additional memory usage compared to sharing the regex.
The
only downside of this approach is that it may be less convenient, for
example,
it won't work with things like <code>OnceLock</code> or
<code>lazy_static</code> or <code>once_cell</code>.</p>
<p>With that said, as of this release, the contention performance
problems have
been greatly reduced. This was achieved by changing the free-list so
that it
was sharded across threads, and that ensuring each sharded mutex
occupies a
single cache line to mitigate false sharing. So while contention may
still
impact performance in some cases, it should be a lot better now.</p>
<p>Because of the changes to how the free-list works, please report any
issues you
find with this release. That not only includes search time regressions
but also
significant regressions in memory usage. Reporting improvements is also
welcome
as well! If possible, provide a reproduction.</p>
<p>Bug fixes:</p>
<ul>
<li>[BUG <a
href="https://redirect.github.com/rust-lang/regex/issues/934">#934</a>](<a
href="https://redirect.github.com/rust-lang/regex/issues/934">rust-lang/regex#934</a>):
Fix a performance bug where high contention on a single regex led to
massive
slow downs.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/rust-lang/regex/commit/554469b8c1116322f3c0a054ceeb610224f8ac65"><code>554469b</code></a>
1.9.5</li>
<li><a
href="https://github.com/rust-lang/regex/commit/48e09a85e46d2b8cc379cd0b69cd98467639f7ff"><code>48e09a8</code></a>
deps: bump regex-automata to 0.3.8</li>
<li><a
href="https://github.com/rust-lang/regex/commit/894dcbe11e45d08b23db24f877574e06f3a69a35"><code>894dcbe</code></a>
regex-automata-0.3.8</li>
<li><a
href="https://github.com/rust-lang/regex/commit/135e11ba9c54b383072ae98043c31dfe1066886a"><code>135e11b</code></a>
changelog: 1.9.5</li>
<li><a
href="https://github.com/rust-lang/regex/commit/f578d74ff42f3df408378ff52d3bdf4433423532"><code>f578d74</code></a>
automata: reduce regex contention somewhat</li>
<li><a
href="https://github.com/rust-lang/regex/commit/9a505a1804f8f89e3448a2a2c5c70573dc6362e5"><code>9a505a1</code></a>
deps: bump to memchr 2.6</li>
<li><a
href="https://github.com/rust-lang/regex/commit/15cdc64869ea5508d96a0e7667c44c7c459986a1"><code>15cdc64</code></a>
cli: remove use of deprecated API</li>
<li><a
href="https://github.com/rust-lang/regex/commit/329c6a32451434fc2f229ad8d3c934c70148ae45"><code>329c6a3</code></a>
ci: use dtolnay@master instead of <a
href="https://github.com/v1"><code>@​v1</code></a></li>
<li><a
href="https://github.com/rust-lang/regex/commit/2637e11b9fb9f3dc8bbfc3cbc625fd454c091d04"><code>2637e11</code></a>
ci: remove stale comment</li>
<li>See full diff in <a
href="https://github.com/rust-lang/regex/compare/1.9.4...1.9.5">compare
view</a></li>
</ul>
</details>
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