Merge #393

393: Bump regex from 1.4.3 to 1.4.4 r=pitkley a=dependabot[bot]

Bumps [regex](https://github.com/rust-lang/regex) from 1.4.3 to 1.4.4.
<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>1.4.4 (2021-03-11)</h1>
<p>This is a small patch release that contains some bug fixes. Notably, it also
drops the <code>thread_local</code> (and <code>lazy_static</code>, via transitivity) dependencies.</p>
<p>Bug fixes:</p>
<ul>
<li>[BUG <a href="https://github.com/rust-lang/regex/issues/362">#362</a>](<a href="https://github.com/rust-lang/regex/pull/362">rust-lang/regex#362</a>):
Memory leaks caused by an internal caching strategy should now be fixed.</li>
<li>[BUG <a href="https://github.com/rust-lang/regex/issues/576">#576</a>](<a href="https://github.com/rust-lang/regex/pull/576">rust-lang/regex#576</a>):
All regex types now implement <code>UnwindSafe</code> and <code>RefUnwindSafe</code>.</li>
<li>[BUG <a href="https://github.com/rust-lang/regex/issues/728">#728</a>](<a href="https://github.com/rust-lang/regex/pull/749">rust-lang/regex#749</a>):
Add missing <code>Replacer</code> impls for <code>Vec&lt;u8&gt;</code>, <code>String</code>, <code>Cow</code>, etc.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rust-lang/regex/commit/951b8b93bbb669e8aa192031a7b66beaa4ea5780"><code>951b8b9</code></a> 1.4.4</li>
<li><a href="https://github.com/rust-lang/regex/commit/5a3570163b7e998b62ee9315522c37465b3cd12b"><code>5a35701</code></a> regex-syntax-0.6.23</li>
<li><a href="https://github.com/rust-lang/regex/commit/967a0905a38e2d19cb58bb3b4c11e6349bd4106f"><code>967a090</code></a> changelog: 1.4.4</li>
<li><a href="https://github.com/rust-lang/regex/commit/e040c1b06397a254cccd3506ee80dbe042360afd"><code>e040c1b</code></a> impl: drop thread_local dependency</li>
<li><a href="https://github.com/rust-lang/regex/commit/5107293238acb96db1c45f795e372214365ee8b4"><code>5107293</code></a> doc: refine use of the word 'unsafe'</li>
<li><a href="https://github.com/rust-lang/regex/commit/691ec58171a78a8a139e1656951c9fbe12708a52"><code>691ec58</code></a> bench: reduce huge regex a bit</li>
<li><a href="https://github.com/rust-lang/regex/commit/f858ff321d7a8129100c95d8d3f8f3f0ff99a55d"><code>f858ff3</code></a> deps: update quickcheck and rand</li>
<li><a href="https://github.com/rust-lang/regex/commit/bf7f8f19c6cf77f8492dcfabd2977884cf5a0dd4"><code>bf7f8f1</code></a> doc: use 'text' instead of 'ignore' for regexes</li>
<li><a href="https://github.com/rust-lang/regex/commit/259863dfb6c72286fcd2e409422a128f227a8607"><code>259863d</code></a> doc: use HTTPS in links</li>
<li><a href="https://github.com/rust-lang/regex/commit/2bab987149d70b32bbd1678a52b3d0f236e78943"><code>2bab987</code></a> api: Replacer for more string types</li>
<li>See full diff in <a href="https://github.com/rust-lang/regex/compare/1.4.3...1.4.4">compare view</a></li>
</ul>
</details>
<br />


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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>