Bump idna from 3.18 to 3.19 in /docs/sphinx

[dependabot]

Bumps idna from 3.18 to 3.19.

Release notes

Sourced from idna's releases.

v3.19

• Restore the std3_rules option, which had no effect since changes to UTS #46 processing in Unicode 16. Note that uts46_remap() defaults to enabling STD3 rules, so direct callers will see input containing non-LDH ASCII characters rejected again.
• Performance improvements to UTS #46 mapping, particularly for ASCII-only domains.
• Test on free-threaded CPython with the GIL disabled and document thread safety.
• Expose the Unicode version of the generated tables as idna.unicode_version, and show it in idna --version.
• Add code, text, codepoint and position attributes to IDNAError so that the failed rule and the offending character can be identified without parsing the exception message.
• The deprecated transitional argument to encode() and uts46_remap() is now completely ignored, and gives a deprecation warning for the latter.
• Reject A-labels that are not the canonical Punycode encoding of their U-label.
• Fix CONTEXTJ violations raising IDNAError instead of InvalidCodepointContext.
• Consistently raise IDNAError for empty labels and non-ASCII bytes passed to label helper functions and the incremental codec.
• Add property-based tests, extended fuzzing targets, coverage measurement, and CI checks that the data tables match the generator output.
• Various code quality and tooling improvements.

Thanks to stefan6419846, LouieLuNZ, and Salvatore Corvaglia for contributions to this release.

Changelog

Sourced from idna's changelog.

3.19 (2026-08-18)

• Restore the std3_rules option, which had no effect since changes to UTS #46 processing in Unicode 16. Note that uts46_remap() defaults to enabling STD3 rules, so direct callers will see input containing non-LDH ASCII characters rejected again.
• Performance improvements to UTS #46 mapping, particularly for ASCII-only domains.
• Test on free-threaded CPython with the GIL disabled and document thread safety.
• Expose the Unicode version of the generated tables as idna.unicode_version, and show it in idna --version.
• Add code, text, codepoint and position attributes to IDNAError so that the failed rule and the offending character can be identified without parsing the exception message.
• The deprecated transitional argument to encode() and uts46_remap() is now completely ignored, and gives a deprecation warning for the latter.
• Reject A-labels that are not the canonical Punycode encoding of their U-label.
• Fix CONTEXTJ violations raising IDNAError instead of InvalidCodepointContext.
• Consistently raise IDNAError for empty labels and non-ASCII bytes passed to label helper functions and the incremental codec.
• Add property-based tests, extended fuzzing targets, coverage measurement, and CI checks that the data tables match the generator output.
• Various code quality and tooling improvements.

Thanks to stefan6419846, LouieLuNZ, and Salvatore Corvaglia for contributions to this release.

Commits

• 03a9a11 Release 3.19
• 2d2a7ef Pre-release 3.19rc0
• 5cce130 Merge pull request #268 from kjd/fix-std3-regex-alert
• 3914b75 Split the STD3 disallowed-character range so uppercase is explicit
• ce9fd98 Merge pull request #267 from kjd/housekeeping
• 809240c Fail CI when the license copyright year is behind the current year
• d9e16c5 Consolidate test fixtures, prune stale gitignore entries, and fix doc typos
• ef30fee Remove dead code and pare back superfluous comments
• b907913 Tighten the version support and Unicode notes in the README
• 6204cbe Ignore local build artifacts and stop packaging stray tooling config
• Additional commits viewable in compare view

[alecgrieser]

We should wait for #4510 to validate this doesn't break the docs build

[alecgrieser]

@dependabot rebase

[alecgrieser]

@dependabot rebase