Documentation for deprecation and removal of voku/portable-utf8

[Hackwar]

User description

This is the documentation PR for joomla/joomla-cms#44810 and joomla/joomla-cms#44654

Edit: first pr is super seeded by joomla/joomla-cms#44489

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PR Type

Documentation

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Description

• Documented the deprecation of voku/portable-utf8 library.

• Added details on its removal in Joomla 6.0.

• Suggested alternative joomla/string package for UTF8 string functions.

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Changes walkthrough 📝

Relevant files

Documentation

new-deprecations.md Documented deprecation of `voku/portable-utf8` library      migrations/52-53/new-deprecations.md Added a section about the deprecation of voku/portable-utf8. Provided a recommendation to use joomla/string package. Mentioned removal of the library in Joomla 6.0. +3/-0      removed-backward-incompatibility.md Documented removal of `voku/portable-utf8` library              migrations/54-60/removed-backward-incompatibility.md Added a section about the removal of voku/portable-utf8. Suggested joomla/string package as an alternative. +3/-0

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