fix: update Cyfrin icon [Fixes #15874]

[IlyaSmiyukha]

Updated Cyfrin Updraft icon on https://ethereum.org/en/developers/learning-tools/ page

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[wackerow]

@konopkja Any reason we're using an app-icon form of their logo? This is a card banner, I would recommend not wrapping in the rounded box.

Would just use this transparent version:

[konopkja]

agree this is better, can you update please?

[IlyaSmiyukha]

done

[wackerow]

Looks great! Thanks @IlyaSmiyukha!

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[wackerow]

@all-contributors please add @IlyaSmiyukha for maintenance

[allcontributors]

@wackerow

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