chore(deps): update rust crate icu to v2.3.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
icu (source)	dependencies	minor	2.2.0 → 2.3.1

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Release Notes

unicode-org/icu4x (icu)

v2.3.1: ICU4X 2.3.1

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Patch release in the 2.3 stream. See CHANGELOG.md

v2.3.0: ICU4X 2.3.0

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The ICU4X Technical Committee is happy to announce ICU4X 2.3, an update to our modular, portable, and secure i18n library.

Important changes in ICU4X 2.3 include:

• icu_segmenter: Preview of our redesigned segmentation engine based on PRI #​555 (new_neo) and an updated line segmenter compliant with Unicode 17 (new_17). Please provide feedback.
• icu_locale::names: Preview of display name formatting with full language identifier support ("English (US)"), Tiny/Light/Heavy depth data slicing, and cross-language FFI bindings. Please provide feedback.
• icu_datetime: Preview of date interval formatting in DateRangeFormatter and in FFI ("Dec 22 – 23, 2026"), plus support for flexible day periods ("8 in the morning") and other improvements.
• icu_experimental::currency: Overhauled the experimental CurrencyFormatter to support generic value representations, ISO code formatting (try_new_code), and accounting usage.
• icu_properties: New home for UTS#35 UnicodeSet parsing with support for :EastAsianWidth=: set syntax and Unicode 17 property updates.

See the full changelog for more information

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.47%. Comparing base (d0a607d) to head (106e31e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #737   +/-   ##
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  Coverage   58.47%   58.47%           
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  Files          57       57           
  Lines       11118    11118           
=======================================
  Hits         6501     6501           
  Misses       4617     4617           

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