chore(deps): update dependency signxml to v5

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
signxml (changelog)	==4.0.4 → ==5.0.0

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Release Notes

XML-Security/signxml (signxml)

v5.0.0

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• X.509 certificate valitation now requires the provided certificate to
  list digital signature as a key usage.

v4.5.1

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• fix rst formatting

v4.4.0

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• Forbid DTD declarations in XML input

• Avoid deprecated method importlib.resources.open_text

v4.3.1

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• Fix comparison logic for ECDSA public keys (#​290)

v4.3.0

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• Remove registration for ec.SECT* ECDSA curves (#​289)

• Fix key info matching behavior (#​287)

v4.2.2

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• Support default namespace with no xmlns=“” undeclarations in
  sign/verify round-trip (#​286)

v4.2.1

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• Add legacy SigningCertificate with IssuerSerial for XAdES
  interoperability (#​282)

v4.2.0

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• Align behaviour of expect_references with docs (#​279). Passing
  expect_references=True to verify(...) now results in a list of
  verify_results, irrespective of the number of references in the
  signature.

• Accept lxml 6.x

v4.1.0

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• Add options to exclude the C14N Transform element in signatures
  (#​274)

v4.0.5

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• Use Python 3.9 compatible typing expression

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Code Review

This pull request updates the signxml dependency from version 4.0.4 to 5.0.0 in the requirements.txt file. There are no review comments, and I have no feedback to provide.