Update dependency idna to v3.15

[mend-for-github-com]

This PR contains the following updates:

Package	Update	Change
idna (changelog)	minor	==3.4 → ==3.15

By merging this PR, the issue #22 will be automatically resolved and closed:

Severity	CVSS Score	Vulnerability
Medium	6.2	CVE-2024-3651
Medium	5.3	CVE-2026-45409

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Release Notes

kjd/idna (idna)

v3.15

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• Enforce DNS-length cap on individual labels early in check_label,
  short-circuiting contextual-rule processing for oversized input
  while staying compatible with UTS 46 usage.
• Tidy core helpers: hoist bidi category sets to module-level
  frozensets (avoiding per-codepoint list construction), simplify
  length checks, and reuse the shared _unicode_dots_re from
  idna.core in the codec module.
• Use raise ... from err for proper exception chaining and
  switch internal string formatting to f-strings.
• Allow flit_core 4.x in the build backend.
• Expand the ruff lint set (flake8-bugbear, flake8-simplify,
  pyupgrade, perflint) and apply the surfaced fixes; pin lint CI
  to Python 3.14.
• Add Dependabot configuration for GitHub Actions.
• Convert README and HISTORY from reStructuredText to Markdown.
• Reference CVE-2026-45409 for the 3.14 advisory in place of the
  initial GHSA identifier.

Thanks to Felix Yan, Stan Ulbrych, and metsw24-max for
contributions to this release.

v3.14

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• Removed opportunity to process long inputs into quadratic
  time by rejecting oversize inputs up-front. Closes a bypass
  of the CVE-2024-3651 mitigation. [CVE-2026-45409]

Thanks to Stan Ulbrych for reporting the issue.

v3.13

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• Correct classification error for codepoint U+A7F1

v3.12

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• Update to Unicode 17.0.0.
• Issue a deprecation warning for the transitional argument.
• Added lazy-loading to provide some performance improvements.
• Removed vestiges of code related to Python 2 support, including
  segmentation of data structures specific to Jython.

Thanks to Rodrigo Nogueira for contributions to this release.

v3.11

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• Update to Unicode 16.0.0, including significant changes to UTS46
  processing. As a result of Unicode ending support for it, transitional
  processing no longer has an effect and returns the same result.
• Add support for Python 3.14, lowest supported version is Python 3.8.
• Various updates to packaging, including PEP 740 support.

v3.10

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• Reverted to Unicode 15.1.0 data. Unicode 16 has some significant changes
  to UTS46 processing that will require more work to properly implement.

v3.9

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• Update to Unicode 16.0.0
• Deprecate setup.cfg in favour of pyproject.toml
• Use ruff for code formatting

Thanks to Waket Zheng for contributions to this release.

v3.8

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• Fix regression where IDNAError exception was not being produced for
  certain inputs.
• Add support for Python 3.13, drop support for Python 3.5 as it is no
  longer testable.
• Documentation improvements
• Updates to package testing using Github actions

Thanks to Hugo van Kemenade for contributions to this release.

v3.7

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• Fix issue where specially crafted inputs to encode() could
  take exceptionally long amount of time to process. [CVE-2024-3651]

Thanks to Guido Vranken for reporting the issue.

v3.6

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• Fix regression to include tests in source distribution.

v3.5

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• Update to Unicode 15.1.0
• String codec name is now "idna2008" as overriding the system codec
  "idna" was not working.
• Fix typing error for codec encoding
• "setup.cfg" has been added for this release due to some downstream
  lack of adherence to PEP 517. Should be removed in a future release
  so please prepare accordingly.
• Removed reliance on a symlink for the "idna-data" tool to comport
  with PEP 517 and the Python Packaging User Guide for sdist archives.
• Added security reporting protocol for project

Thanks Jon Ribbens, Diogo Teles Sant'Anna, Wu Tingfeng for contributions
to this release.

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