Update dependency xmltodict to v0.15.1

This MR contains the following updates:

Package	Type	Update	Change
xmltodict	ironbank-pypi	minor	0.14.1 -> 0.15.1

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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

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• 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

v0.14.2

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• Revert "Ensure significant whitespace is not trimmed"
  • This changed was backwards incompatible and caused downstream issues.

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