Bump lxml from 4.5.0 to 4.6.2#5

Bumps [lxml](https://github.com/lxml/lxml) from 4.5.0 to 4.6.2. <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/lxml/lxml/blob/master/CHANGES.txt">lxml's changelog</a>.</em></p> <blockquote> <h1>4.6.2 (2020-11-26)</h1> <h2>Bugs fixed</h2> <ul> <li>A vulnerability (CVE-2020-27783) was discovered in the HTML Cleaner by Yaniv Nizry, which allowed JavaScript to pass through. The cleaner now removes more sneaky &quot;style&quot; content.</li> </ul> <h1>4.6.1 (2020-10-18)</h1> <h2>Bugs fixed</h2> <ul> <li>A vulnerability was discovered in the HTML Cleaner by Yaniv Nizry, which allowed JavaScript to pass through. The cleaner now removes more sneaky &quot;style&quot; content.</li> </ul> <h1>4.6.0 (2020-10-17)</h1> <h2>Features added</h2> <ul> <li> <p>GH#310: <code>lxml.html.InputGetter</code> supports <code>__len__()</code> to count the number of input fields. Patch by Aidan Woolley.</p> </li> <li> <p><code>lxml.html.InputGetter</code> has a new <code>.items()</code> method to ease processing all input fields.</p> </li> <li> <p><code>lxml.html.InputGetter.keys()</code> now returns the field names in document order.</p> </li> <li> <p><a href="https://github-redirect.dependabot.com/lxml/lxml/issues/309">GH-309</a>: The API documentation is now generated using <code>sphinx-apidoc</code>. Patch by Chris Mayo.</p> </li> </ul> <h2>Bugs fixed</h2> <ul> <li> <p>LP#1869455: C14N 2.0 serialisation failed for unprefixed attributes when a default namespace was defined.</p> </li> <li> <p><code>TreeBuilder.close()</code> raised <code>AssertionError</code> in some error cases where it should have raised <code>XMLSyntaxError</code>. It now raises a combined exception to keep up backwards compatibility, while switching to <code>XMLSyntaxError</code> as an interface.</p> </li> </ul> <p>4.5.2 (2020-07-09)</p> <!-- raw HTML omitted --> </blockquote> <p>... (truncated)</p> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/lxml/lxml/commit/4cb57362deb23bca0f70f41ab1efa13390fcdbb1"><code>4cb5736</code></a> Work around Py2's lack of &quot;re.ASCII&quot;.</li> <li><a href="https://github.com/lxml/lxml/commit/c30106ff2648cdafe7857654e9606c491b1acf4d"><code>c30106f</code></a> Prepare release of 4.6.2.</li> <li><a href="https://github.com/lxml/lxml/commit/a105ab8dc262ec6735977c25c13f0bdfcdec72a7"><code>a105ab8</code></a> Prevent combinations of &lt;math/svg&gt; and &lt;style&gt; to sneak JavaScript through th...</li> <li><a href="https://github.com/lxml/lxml/commit/c053dc159c7f0a6a98922c937a0baede7ce7af9d"><code>c053dc1</code></a> Add a recipe for a look-ahead generator to allow modifications during tree it...</li> <li><a href="https://github.com/lxml/lxml/commit/b083124281d824eb861ff58e7276a5c1f1d8c18d"><code>b083124</code></a> lxml actually works in Py3.9.</li> <li><a href="https://github.com/lxml/lxml/commit/0f80590d7ebe62c61d2bdf2a220a093821dcbab8"><code>0f80590</code></a> lxml actually works in Py3.9.</li> <li><a href="https://github.com/lxml/lxml/commit/fd8893ccb538e95c5acb2a2b47f0e87003de5b0d"><code>fd8893c</code></a> Add a doc note that the .find() methods are usually faster than one might exp...</li> <li><a href="https://github.com/lxml/lxml/commit/eb6df27fc265cea4462f966282a701acdad5d167"><code>eb6df27</code></a> Update release version on homepage.</li> <li><a href="https://github.com/lxml/lxml/commit/69b5c9bd575800f80a6515aeef6421f33db0294d"><code>69b5c9b</code></a> Automate the build artefact downloading from github and appveyor.</li> <li><a href="https://github.com/lxml/lxml/commit/61432a8489657744ed32367ed9fb17fafe405d8e"><code>61432a8</code></a> Prepare release of lxml 4.6.1.</li> <li>Additional commits viewable in <a href="https://github.com/lxml/lxml/compare/lxml-4.5.0...lxml-4.6.2">compare view</a></li> </ul> </details> <br /> [](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. 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