fix(deps): update rust crate roxmltree to 0.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
roxmltree	dependencies	minor	0.20.0 -> 0.21.0

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Release Notes

RazrFalcon/roxmltree (roxmltree)

v0.21.0

Compare Source

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.

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