Update dependency xmltodict to ^0.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
xmltodict	^0.14.0 → ^0.15.0

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Release Notes

martinblech/xmltodict (xmltodict)

v0.15.1

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• Security: Further harden XML injection prevention during unparse (follow-up to
  v0.15.0). In addition to '<'/'>' rejection, now also reject element and
  attribute names (including @xmlns prefixes) that:
  • start with '?' or '!'
  • contain '/' or any whitespace
  • contain quotes (' or ") or '='
  • are non-strings (names must be str; no coercion)

v0.15.0

Compare Source

• Security: Prevent XML injection (CVE-2025-9375) by rejecting '<'/'>' in
  element and attribute names (including @xmlns prefixes) during unparse.
  This limits validation to avoiding tag-context escapes; attribute values
  continue to be escaped by the SAX XMLGenerator.
  Advisory: https://fluidattacks.com/advisories/mono

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