Update dependency idna to v3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
idna (changelog)	==3.7 -> ==3.8

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Release Notes

kjd/idna (idna)

v3.8

Compare Source

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

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