Bumps lxml from 4.6.2 to 4.6.5.

Sourced from lxml's changelog.

4.6.5 (2021-12-12)

Bugs fixed

• A vulnerability (GHSL-2021-1038) in the HTML cleaner allowed sneaking script content through SVG images.

• A vulnerability (GHSL-2021-1037) in the HTML cleaner allowed sneaking script content through CSS imports and other crafted constructs.

4.6.4 (2021-11-01)

Features added

• GH#317: A new property system_url was added to DTD entities. Patch by Thirdegree.

• GH#314: The STATIC_* variables in setup.py can now be passed via env vars. Patch by Isaac Jurado.

4.6.3 (2021-03-21)

Bugs fixed

• A vulnerability (CVE-2021-28957) was discovered in the HTML Cleaner by Kevin Chung, which allowed JavaScript to pass through. The cleaner now removes the HTML5 formaction attribute.

• a9611ba Fix a test in Py2.
• a3eacbc Prepare release of 4.6.5.
• b7ea687 Update changelog.
• 69a7473 Cleaner: cover some more cases where scripts could sneak through in specially...
• 54d2985 Fix condition in test decorator.
• 4b220b5 Use the non-depcrecated TextTestResult instead of _TextTestResult (GH-333)
• d85c6de Exclude a test when using the macOS system libraries because it fails with li...
• cd4bec9 Add macOS-M1 as wheel build platform.
• fd0d471 Install automake and libtool in macOS build to be able to install the latest ...
• f233023 Cleaner: Remove SVG image data URLs since they can embed script content.
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