chore(deps-dev): update lxml requirement from >=6.1.0 to >=6.1.1

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Updates the requirements on lxml to permit the latest version.

Changelog

Sourced from lxml's changelog.

6.1.1 (2026-05-18)

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.

6.1.0 (2026-04-17)

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.

6.0.4 (2026-04-12)

Bugs fixed

• LP#2148019: Spurious MemoryError during namespace cleanup.

... (truncated)

Commits

• b4a4c59 Build: Fix build in Py3.8.
• a116dcb Fix typo: type annotions -> type annotations in PEP 560 comments (GH-504)
• 7287a75 Prepare release of 6.1.1.
• 5927a6d Add missing "xlink:href" to the known HTML link attributes.
• 23efeb4 Build: Fix build in Py3.8.
• 2c0563b Build: Add bug patch for libxslt 1.1.43 and apply it during the static librar...
• 8a35fcc Fix doctest in PyPy3.9.
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