build(deps): update lxml requirement from ~=4.0 to ~=4.6

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Updates the requirements on lxml to permit the latest version.

Changelog

Sourced from lxml's changelog.

4.6.2 (2020-11-26)

Bugs fixed

• 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 "style" content.

4.6.1 (2020-10-18)

Bugs fixed

• A vulnerability was discovered in the HTML Cleaner by Yaniv Nizry, which allowed JavaScript to pass through. The cleaner now removes more sneaky "style" content.

4.6.0 (2020-10-17)

Features added

• GH#310: lxml.html.InputGetter supports __len__() to count the number of input fields. Patch by Aidan Woolley.

• lxml.html.InputGetter has a new .items() method to ease processing all input fields.

• lxml.html.InputGetter.keys() now returns the field names in document order.

• GH-309: The API documentation is now generated using sphinx-apidoc. Patch by Chris Mayo.

Bugs fixed

• LP#1869455: C14N 2.0 serialisation failed for unprefixed attributes when a default namespace was defined.

• TreeBuilder.close() raised AssertionError in some error cases where it should have raised XMLSyntaxError. It now raises a combined exception to keep up backwards compatibility, while switching to XMLSyntaxError as an interface.

4.5.2 (2020-07-09)

... (truncated)

Commits

• 4cb5736 Work around Py2's lack of "re.ASCII".
• c30106f Prepare release of 4.6.2.
• a105ab8 Prevent combinations of <math/svg> and <style> to sneak JavaScript through th...
• c053dc1 Add a recipe for a look-ahead generator to allow modifications during tree it...
• b083124 lxml actually works in Py3.9.
• 0f80590 lxml actually works in Py3.9.
• fd8893c Add a doc note that the .find() methods are usually faster than one might exp...
• eb6df27 Update release version on homepage.
• 69b5c9b Automate the build artefact downloading from github and appveyor.
• 61432a8 Prepare release of lxml 4.6.1.
• Additional commits viewable in compare view

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