Update dependency idna to v3.18

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
idna (changelog)	==3.3 → ==3.18

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Release Notes

kjd/idna (idna)

v3.18

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• When decoding a domain, add a display argument that will pass
  through invalid labels rather than raising an exception.

v3.17

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• Substantial 75% reduction in memory usage through new data
  structures and some optimization in processing speed.
• Added a general 1024-character input length cap to the public
  validation, conversion, and codec entry points. This is well above
  any legitimate domain or label and guards against pathological
  inputs.

v3.16

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• Add a command-line interface (python -m idna, also available as
  the idna script). Encodes or decodes one or more domains supplied
  as arguments or on standard input, with options to select A-label
  or U-label output and control error handling.
• Raise the minimum supported Python version to 3.9
• Various code quality improvements

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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v3.12

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v3.11

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v3.10

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v3.9

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v3.8

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What's Changed

• 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.

Full Changelog: kjd/idna@v3.7...v3.8

v3.7

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What's Changed

• 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.

Full Changelog: kjd/idna@v3.6...v3.7

v3.6

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v3.5

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v3.4

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