[BUG] Incorrect flag used for Belarusian documentation in README

[jnsn]

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• I have searched for my issue and have not found a work-in-progress/duplicate/resolved issue.
• I have tested that this issue has not been fixed in the latest (beta or stable) release.
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• This issue is about a bug (if it is not, please use the correct template).

UniGetUI Version

3.3.1

Windows version, edition, and architecture

Windows 11 Pro 26100.4946

Describe your issue

The flag icon used for Belarus in the README file is wrong, it's using be which is the country code for Belgium. The correct value should be by.

Steps to reproduce the issue

No response

UniGetUI Log

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Package Managers Logs

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Relevant information

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Screenshots and videos

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