Auto merge of #26760 - servo:dependabot/cargo/nom-4.2.3, r=jdm

Bump nom from 4.1.1 to 4.2.3

Bumps [nom](https://github.com/Geal/nom) from 4.1.1 to 4.2.3.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/Geal/nom/blob/master/CHANGELOG.md">nom's changelog</a>.</em></p>
<blockquote>
<h2>4.2.3 - 2019-03-23</h2>
<h3>Fixed</h3>
<ul>
<li>add missing <code>build.rs</code> file to the package</li>
<li>fix code comparison links in changelog</li>
</ul>
<h2>4.2.2 - 2019-03-04</h2>
<h3>Fixed</h3>
<ul>
<li>regression in do_parse macro import for edition 2018</li>
</ul>
<h2>4.2.1 - 2019-02-27</h2>
<h3>Fixed</h3>
<ul>
<li>macro expansion error in <code>do_parse</code> due to <code>compile_error</code> macro usage</li>
</ul>
<h2>4.2.0 - 2019-01-29</h2>
<h3>Thanks</h3>
<ul>
<li><a href="https://github.com/JoshMcguigan">@JoshMcguigan</a> for unit test fixes</li>
<li><a href="https://github.com/oza">@oza</a> for documentation fixes</li>
<li><a href="https://github.com/wackywendell">@wackywendell</a> for better error conversion</li>
<li><a href="https://github.com/Zebradil">@Zebradil</a> for documentation fixes</li>
<li><a href="https://github.com/tsraom">@tsraom</a> for new combinators</li>
<li><a href="https://github.com/hcpl">@hcpl</a> for minimum Rust version tests</li>
<li><a href="https://github.com/KellerFuchs">@KellerFuchs</a> for removing some unsafe uses in float parsing</li>
</ul>
<h3>Changed</h3>
<ul>
<li>macro import in edition 2018 code should work without importing internal macros now</li>
<li>the regex parsers do not require the calling code to have imported the regex crate anymore</li>
<li>error conversions are more ergonomic</li>
<li>method combinators are now deprecated. They might be moved to a separate crate</li>
<li>nom now specifies Rust 1.24.1 as minimum version. This was already the case before, now it is made explicit</li>
</ul>
<h3>Added</h3>
<ul>
<li><code>many0_count</code> and <code>many1_count</code> to count applications of a parser instead of
accumulating its results in a <code>Vec</code></li>
</ul>
<h3>Fixed</h3>
<ul>
<li>overflow in the byte wrapper for bit level parsers</li>
<li><code>f64</code> parsing does not use <code>transmute</code> anymore</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="8d195e7728"><code>8d195e7</code></a> update changelog and bump version to 4.2.3</li>
<li><a href="0761cca7f2"><code>0761cca</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/Geal/nom/issues/779">#779</a> from khernyo/issue-768-bitvec-parser</li>
<li><a href="ed915073c8"><code>ed91507</code></a> Merge branch 'master' into issue-768-bitvec-parser</li>
<li><a href="c543bc1c6a"><code>c543bc1</code></a> update changelog and bump version to 4.2.2</li>
<li><a href="e826f28999"><code>e826f28</code></a> fix again edition 2018 macro import in do_parse</li>
<li><a href="b645b10957"><code>b645b10</code></a> update changelog and bump version to 4.2.1</li>
<li><a href="e17fe771ab"><code>e17fe77</code></a> activate LTO and jemallocator for benchmarks</li>
<li><a href="027fe80a05"><code>027fe80</code></a> move to criterion for benchmarking</li>
<li><a href="80eb111ec9"><code>80eb111</code></a> fix previous commit</li>
<li><a href="34df62047d"><code>34df620</code></a> fix macro import in do_parse</li>
<li>Additional commits viewable in <a href="https://github.com/Geal/nom/compare/4.1.1...4.2.3">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -3718,11 +3718,12 @@ checksum = "9a2228dca57108069a5262f2ed8bd2e82496d2e074a06d1ccc7ce1687b6ae0a2"
 
 [[package]]
 name = "nom"
-version = "4.1.1"
+version = "4.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c349f68f25f596b9f44cf0e7c69752a5c633b0550c3ff849518bfba0233774a"
+checksum = "2ad2a91a8e869eeb30b9cb3119ae87773a8f4ae617f41b1eb9c154b2905f7bd6"
 dependencies = [
  "memchr",
+ "version_check",
 ]
 
 [[package]]