Update simpleidn requirement from ~> 0.2.1 to >= 0.2.1, < 0.4.0

[dependabot]

Updates the requirements on simpleidn to permit the latest version.

Changelog

Sourced from simpleidn's changelog.

0.3.0 (2026-09-01)

• Update the UTS #46 / IDNA mapping table to Unicode 17.0.0 (was 15.1.0).
• to_unicode now raises SimpleIDN::ConversionError when an xn-- label decodes to an empty or all-ASCII string. UTS #46 (Processing step 4.2) requires this, and it closes a spoofing loophole.
• Move CI from Travis to GitHub Actions. Test on Ruby 2.7–3.5, JRuby, and TruffleRuby, plus Windows and macOS.
• Reduce the packaged gem size. The gem no longer ships the raw IdnaMappingTable.txt source data.
• Add gemspec metadata (source code, changelog, bug tracker URIs) and require MFA for gem pushes.
• Convert the README to Markdown and expand the documentation.
• Add edge-case specs: encodings, frozen strings, emoji, transitional mode, alternative label separators, and the new error cases.

0.2.3 (2024-05-22)

• Update the UTS #46 / IDNA mapping table to Unicode 15.1.
• Drop the unf runtime dependency. The gem now has no runtime dependencies.

0.2.2 (2024-04-26)

• Fix file permissions in the packaged gem.

0.2.1 (2021-01-14)

• Punycode and UTS #46 mapping fixes.

Earlier releases are not documented here. See the git history.

Commits

• 470f8bd Remove redundant homepage_uri metadata key
• 55f031a Bump version to 0.3.0
• d5e30d3 Modernize docs and gemspec
• 303af57 Update UTS #46 mapping table to Unicode 17.0.0
• 9c3e8fd Move CI from Travis to GitHub Actions
• 606fd91 Merge pull request #27 from Bo98/idna-update
• a90933f Bump version for release.
• 8924e84 Updated year.
• 5c56a20 Added ruby 3.3 build target.
• 8a59c4b Merge pull request #26 from Bo98/no-unf
• Additional commits viewable in compare view

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