Auto merge of #26693 - servo:dependabot/cargo/regex-1.3.7, r=jdm

Bump regex from 1.3.4 to 1.3.7

Bumps [regex](https://github.com/rust-lang/regex) from 1.3.4 to 1.3.7.
<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>1.3.7 (2020-04-17)</h1>
<p>This release contains a small bug fix that fixes how <code>regex</code> forwards crate
features to <code>regex-syntax</code>. In particular, this will reduce recompilations in
some cases.</p>
<p>Bug fixes:</p>
<ul>
<li>[BUG <a href="https://github-redirect.dependabot.com/rust-lang/regex/issues/665">#665</a>](<a href="https://github-redirect.dependabot.com/rust-lang/regex/pull/665">rust-lang/regex#665</a>):
Fix feature forwarding to <code>regex-syntax</code>.</li>
</ul>
<h1>1.3.6 (2020-03-24)</h1>
<p>This release contains a sizable (~30%) performance improvement when compiling
some kinds of large regular expressions.</p>
<p>Performance improvements:</p>
<ul>
<li>[PERF <a href="https://github-redirect.dependabot.com/rust-lang/regex/issues/657">#657</a>](<a href="https://github-redirect.dependabot.com/rust-lang/regex/pull/657">rust-lang/regex#657</a>):
Improvement performance of compiling large regular expressions.</li>
</ul>
<h1>1.3.5 (2020-03-12)</h1>
<p>This release updates this crate to Unicode 13.</p>
<p>New features:</p>
<ul>
<li>[FEATURE <a href="https://github-redirect.dependabot.com/rust-lang/regex/issues/653">#653</a>](<a href="https://github-redirect.dependabot.com/rust-lang/regex/pull/653">rust-lang/regex#653</a>):
Update <code>regex-syntax</code> to Unicode 13.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="adb4aa3ce4"><code>adb4aa3</code></a> regex-1.3.7</li>
<li><a href="761284d2ee"><code>761284d</code></a> changelog: 1.3.7</li>
<li><a href="672d877019"><code>672d877</code></a> sparse: add better Debug impl</li>
<li><a href="b490e0b2e5"><code>b490e0b</code></a> cargo: tweak features for regex-syntax</li>
<li><a href="3221cdb1e3"><code>3221cdb</code></a> 1.3.6</li>
<li><a href="3d1c01c8f0"><code>3d1c01c</code></a> changelog: 1.3.6</li>
<li><a href="85ac3852cd"><code>85ac385</code></a> compile: add fast path for c_char</li>
<li><a href="3ff6ae19ee"><code>3ff6ae1</code></a> syntax: improve allocation of escape_into</li>
<li><a href="c1585975f4"><code>c158597</code></a> syntax: regenerate tables for version info</li>
<li><a href="6ed3857357"><code>6ed3857</code></a> 1.3.5</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/regex/compare/1.3.4...regex-1.3.7">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -4477,9 +4477,9 @@ checksum = "825740057197b7d43025e7faf6477eaabc03434e153233da02d1f44602f71527"
 
 [[package]]
 name = "regex"
-version = "1.3.4"
+version = "1.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "322cf97724bea3ee221b78fe25ac9c46114ebb51747ad5babd51a2fc6a8235a8"
+checksum = "a6020f034922e3194c711b82a627453881bc4682166cabb07134a10c26ba7692"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -4489,9 +4489,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.16"
+version = "0.6.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1132f845907680735a84409c3bebc64d1364a5683ffbce899550cd09d5eaefc1"
+checksum = "7fe5bd57d1d7414c6b5ed48563a2c855d995ff777729dcd91c369ec7fea395ae"
 
 [[package]]
 name = "remove_dir_all"