chore(deps): update rust crate quick-xml to v0.39.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
quick-xml	dependencies	patch	0.39.2 → 0.39.4

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Release Notes

tafia/quick-xml (quick-xml)

v0.39.4

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Bug Fixes

• #​957: Fix slice-index panic when reading malformed DTD whose unknown markup
  is split across BufReader chunks. As with #​950, the returned
  Event::DocType may contain the malformed DTD; this fix only ensures that
  the parser does not panic.
• #​960: Fix sibling slice-index panic when a single chunk delivers < followed
  by 9+ bytes of unknown markup inside a DTD internal subset. Same disposition
  as #​957 / #​950: parser must not panic; DTD validity reporting is a future
  improvement.

v0.39.3

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Bug Fixes

• #​950: Fix subtraction with overflow when parse malformed DTD in some cases.
  Note, that currently we do not check the validity of DTD, so the returned Event::DocType
  may contain the malformed DTD.

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