chore(deps): Bump regex from 1.7.3 to 1.8.1 (#645)

Bumps [regex](https://github.com/rust-lang/regex) from 1.7.3 to 1.8.1.
<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>1.8.1 (2023-04-21)</h1>
<p>This is a patch release that fixes a bug where a regex match could be
reported
where none was found. Specifically, the bug occurs when a pattern
contains some
literal prefixes that could be extracted <em>and</em> an optional word
boundary in the
prefix.</p>
<p>Bug fixes:</p>
<ul>
<li>[BUG <a
href="https://redirect.github.com/rust-lang/regex/issues/981">#981</a>](<a
href="https://redirect.github.com/rust-lang/regex/issues/981">rust-lang/regex#981</a>):
Fix a bug where a word boundary could interact with prefix literal
optimizations and lead to a false positive match.</li>
</ul>
<h1>1.8.0 (2023-04-20)</h1>
<p>This is a sizeable release that will be soon followed by another
sizeable
release. Both of them will combined close over 40 existing issues and
PRs.</p>
<p>This first release, despite its size, essentially represent
preparatory work
for the second release, which will be even bigger. Namely, this
release:</p>
<ul>
<li>Increases the MSRV to Rust 1.60.0, which was released about 1 year
ago.</li>
<li>Upgrades its dependency on <code>aho-corasick</code> to the recently
release 1.0
version.</li>
<li>Upgrades its dependency on <code>regex-syntax</code> to the
simultaneously released
<code>0.7</code> version. The changes to <code>regex-syntax</code>
principally revolve around a
rewrite of its literal extraction code and a number of simplifications
and
optimizations to its high-level intermediate representation (HIR).</li>
</ul>
<p>The second release, which will follow ~shortly after the release
above, will
contain a soup-to-nuts rewrite of every regex engine. This will be done
by
bringing <a
href="https://github.com/BurntSushi/regex-automata"><code>regex-automata</code></a>
into
this repository, and then changing the <code>regex</code> crate to be
nothing but an API
shim layer on top of <code>regex-automata</code>'s API.</p>
<p>These tandem releases are the culmination of about 3
years of on-and-off work that <a
href="https://redirect.github.com/rust-lang/regex/issues/656">began in
earnest in March
2020</a>.</p>
<p>Because of the scale of changes involved in these releases, I would
love to
hear about your experience. Especially if you notice undocumented
changes in
behavior or performance changes (positive <em>or</em> negative).</p>
<p>Most changes in the first release are listed below. For more details,
please
see the commit log, which reflects a linear and decently documented
history
of all changes.</p>
<p>New features:</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="4e29fceace"><code>4e29fce</code></a>
1.8.1</li>
<li><a
href="8a7cb645cf"><code>8a7cb64</code></a>
deps: bump regex-syntax to 0.7.1</li>
<li><a
href="31c845296c"><code>31c8452</code></a>
regex-syntax-0.7.1</li>
<li><a
href="960aadeba0"><code>960aade</code></a>
changelog: 1.8.1</li>
<li><a
href="f003d72578"><code>f003d72</code></a>
impl: fix prefix literal matching bug</li>
<li><a
href="93316a3b1a"><code>93316a3</code></a>
doc: update MSRV in README</li>
<li><a
href="070374f287"><code>070374f</code></a>
release: 1.8.0</li>
<li><a
href="a73c61cecb"><code>a73c61c</code></a>
fuzz: get rid of 'named-profiles' feature</li>
<li><a
href="7cd75d22b5"><code>7cd75d2</code></a>
changelog: tweaks to 1.8 release entry</li>
<li><a
href="33898de870"><code>33898de</code></a>
syntax: fix bug in new alternation literal analysis</li>
<li>Additional commits viewable in <a
href="https://github.com/rust-lang/regex/compare/1.7.3...1.8.1">compare
view</a></li>
</ul>
</details>
<br />


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Cargo.lock

@@ -265,9 +265,9 @@ dependencies = [
 
 [[package]]
 name = "aho-corasick"
-version = "0.7.20"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+checksum = "67fc08ce920c31afb70f013dcce1bfc3a3195de6a228474e45e1f145b36f8d04"
 dependencies = [
  "memchr",
 ]
@@ -1752,7 +1752,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "regex",
- "regex-syntax",
+ "regex-syntax 0.6.29",
  "structmeta",
  "syn 1.0.109",
 ]
@@ -2039,13 +2039,13 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.7.3"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b1f693b24f6ac912f4893ef08244d70b6067480d2f1a46e950c9691e6749d1d"
+checksum = "af83e617f331cc6ae2da5443c602dfa5af81e517212d9d611a5b3ba1777b5370"
 dependencies = [
  "aho-corasick",
  "memchr",
- "regex-syntax",
+ "regex-syntax 0.7.1",
 ]
 
 [[package]]
@@ -2054,6 +2054,12 @@ version = "0.6.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
 
+[[package]]
+name = "regex-syntax"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a5996294f19bd3aae0453a862ad728f60e6600695733dd5df01da90c54363a3c"
+
 [[package]]
 name = "retain_mut"
 version = "0.1.9"