Bump roxmltree from 0.20.0 to 0.21.1

[dependabot]

Bumps roxmltree from 0.20.0 to 0.21.1.

Changelog

Sourced from roxmltree's changelog.

[0.21.1] - 2025-10-09

Fixed

• Remove implict 'static lifetime bound on EntityResolver dyn trait type alias.
• Upgrade EntityResolver dyn trait type alias from FnMut to Fn to resolve lifetime issues.

[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.

Commits

• 67644e1 Also upgrade it from FnMut to Fn as borrowing entities from elsewhere wont wo...
• cfc15b7 Fix implicit 'static bound on EntityResolve dyn trait type alias.
• 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...
• Additional commits viewable in compare view

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[jaberjaber23]

Minor version bump, mostly performance improvements. Approve if CI passes.