refactor: update GHS currency symbol to use the correct Unicode character

[rexthecoder]

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Summary of Changes

Hello @rexthecoder, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the intl package by enhancing the accuracy of currency symbol representation. Specifically, it addresses the Ghana Cedi (GHS) by replacing its generic textual representation with its official Unicode symbol. This change ensures that applications utilizing this package will display the correct and internationally recognized symbol for the Ghana Cedi, improving overall internationalization and user experience.

Highlights

• Currency Symbol Correction: The pull request updates the currency symbol for the Ghana Cedi (GHS) to use its correct Unicode character.
• Unicode Character Implementation: The GHS entry in the simpleCurrencySymbols map has been changed from the string 'GHS' to the Unicode character 'GH\u20B5'.

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[gemini-code-assist]

Code Review

This pull request correctly updates the currency symbol for the Ghanaian Cedi (GHS) to use the correct Unicode character. My main feedback is to add a test case to verify this change, as required by the repository's contribution guidelines.

[github-actions]

PR Health

License Headers ✔️

// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

Files
no missing headers

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API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbol	Leaking sources
intl	StringStack	intl/date_format.dart::_DateFormatField::parse::input intl/date_format.dart::_DateFormatField::parseLoose::input intl/date_format.dart::_DateFormatField::parseLiteral::input intl/date_format.dart::_DateFormatField::parseLiteralLoose::input intl/date_format.dart::_DateFormatField::throwFormatException::stack intl/number_parser_base.dart::NumberParserBase::input intl/number_parser_base.dart::NumberParserBase::parseNumber::input
intl	DateBuilder	intl/date_format.dart::_DateFormatField::parse::dateFields intl/date_format.dart::_DateFormatField::parseLoose::dateFields

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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?
intl	None	0.20.2	0.20.3-wip	0.20.2	✔️

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Coverage ✔️

File	Coverage
pkgs/intl/lib/src/intl/constants.dart	💚 100 %

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Changelog Entry ✔️

Package	Changed Files

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