Update community-events.json

[LingTian]

Add in ETH Riyadh 2025

Add one community event ETH Riyadh in December

Description

Update ETH Riyadh event's name, website and description

Related Issue

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[wackerow]

Looks good, thanks @LingTian!

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[wackerow]

@all-contributors please add @LingTian for event

[allcontributors]

@wackerow

I couldn't determine any contributions to add, did you specify any contributions?
Please make sure to use valid contribution names.

[wackerow]

@all-contributors please add @LingTian for eventOrganizing

[allcontributors]

@wackerow

I've put up a pull request to add @LingTian! 🎉