chore(deps): update dependency lxml to v6.1.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
lxml (source, changelog)	==6.0.1 → ==6.1.1

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Release Notes

lxml/lxml (lxml)

v6.1.1

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Bugs fixed

• The known link attributes in lxml.html.defs.link_attrs were missing xlink:href,
  which can be used for URL bypass attacks in embedded SVG/MathML/etc. content.
  GHSA-4jhm-jv67-739f

• The Linux wheels use a patched libxslt 1.1.43, fixing CVE-2025-7424 and CVE-2025-11731.

• The Windows wheels use libxslt 1.1.45, fixing CVE-2025-7424 and CVE-2025-11731.

v6.1.0

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This release fixes a possible external entity injection (XXE) vulnerability in
iterparse() and the ETCompatXMLParser.

Features added

• GH#486: The HTML ARIA accessibility attributes were added to the set of safe attributes
  in lxml.html.defs. This allows lxml_html_clean to pass them through.
  Patch by oomsveta.

• The default chunk size for reading from file-likes in iterparse() is now configurable
  with a new chunk_size argument.

Bugs fixed

• LP#2146291: The resolve_entities option was still set to True for
  iterparse and ETCompatXMLParser, allowing for external entity injection (XXE)
  when using these parsers without setting this option explicitly.
  The default was now changed to 'internal' only (as for the normal XML and HTML parsers
  since lxml 5.0).
  Issue found by Sihao Qiu as CVE-2026-41066.

v6.0.4

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Bugs fixed

• LP#2148019: Spurious MemoryError during namespace cleanup.

v6.0.3

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Bugs fixed

• Several out of memory error cases now raise MemoryError that were not handled before.

• Slicing with large step values (outside of +/- sys.maxsize) could trigger undefined C behaviour.

• LP#2125399: Some failing tests were fixed or disabled in PyPy.

• LP#2138421: Memory leak in error cases when setting the public_id or system_url of a document.

• Memory leak in case of a memory allocation failure when copying document subtrees.

• When mapping an XPath result to Python failed, the result memory could leak.

• When preparing an XSLT transform failed, the XSLT parameter memory could leak.

Other changes

• Built using Cython 3.2.4.

• Binary wheels use zlib 1.3.2.

v6.0.2

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Bugs fixed

• LP#2125278: Compilation with libxml2 2.15.0 failed.
  Original patch by Xi Ruoyao.

• Setting decompress=True in the parser had no effect in libxml2 2.15.

• Binary wheels on Linux and macOS use the library version libxml2 2.14.6.
  See https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.14.6

• Test failures in libxml2 2.15.0 were fixed.

Other changes

• Binary wheels for Py3.9-3.11 on the riscv64 architecture were added.

• Error constants were updated to match libxml2 2.15.0.

• Built using Cython 3.1.4.

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[Gui-FernandesBR]

Closing: this PR edits the autogenerated docs/requirements.txt directly (compiled from docs/requirements.in). Renovate's config is being corrected in #1039 — the pip-compile manager will regenerate this file, and pip_requirements is disabled for it, so these line-by-line PRs won't be recreated.

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