Update roxmltree requirement from 0.20 to 0.21 in the cargo group

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Updates the requirements on roxmltree to permit the latest version.
Updates roxmltree to 0.21.0

Changelog

Sourced from roxmltree's changelog.

[0.21.0] - 2025-10-04

Added

• ParsingOptions::entity_resolver can be used to resolve external entities referenced via public ID and URI.

Changed

• Node::has_attribute, Node::attribute and Node::attribute_node match local names similar to how Node::has_tag_name works.
• Various internal performance improvements, e.g. devirtualization of token dispatch and usage of memchr for finding delimiters.

Fixed

• Possible panic when entity resolution yields unbalanced tags.
• Quadratic runtime when merging consecutive text nodes.

[0.20.0] - 2024-05-23

Added

• Attribute::range, Attribute::range_qname, Attribute::range_value. Thanks to @​Jayonas

Changed

• Attribute::position is deprecated now.
• The positions build feature uses a bit more memory now to better preserve attribute ranges.

[0.19.0] - 2023-11-18

Changed

• xmlparser is no longer a dependency and its fork is used internally.
• ~5% faster parsing.
• Fallback to Rc when Arc isn't available.
• Bump MSRV to 1.60
• Bump edition to 2021
• Error variants have changed quite a lot.
• XML declaration validation was simplified. We no longer check for attributes content. Meaning that version, encoding and standalone can contain any value now. But we still do check attribute names and order. And while we did validated those attributes before, they weren't really affecting the parser in any way. Therefore the parsing behavior is mostly unchanged.

Fixed

• ParsingOptions::allow_dtd = false would not trigger an error when an empty DTD was present.

Removed

• The xmlparser dependency.

[0.18.1] - 2023-09-30

Added

• ExpandedName::from_static. Thanks to @​WhyNotHugo

Fixed

• Replace \r in CDATA as well.
• no_std build. Thanks to @​wenyuzhao

... (truncated)

Commits

• cd5b0e8 Fix benchmark build, update changelog and bump version.
• 634f4d0 Add support for resolving external entities
• a1bd711 Adjust attribute accessors to match purely on local names
• 5528680 Fix lints emitted by current nightly Clippy.
• d2c7801 Speed-up attribute parsing by splitting tokenizing and verification
• 239114a Add benchmark using gigantic SVG containing huge attribute values.
• 3b09447 Avoid quadratic runtime when merging text nodes
• 6df398d Refine and extend synthetic benchmarks stressing CDATA, text and attribute va...
• faffff8 Use of try_consume_reference always treats failure as fatal, so no need to ba...
• bc7a816 Devirtualize XmlEvents dispatch to give the optimizer full visibility
• Additional commits viewable in compare view

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