update community meetup title and url

[hsy822]

Description

• Updated the title and link for the Jeju Blockchain Meetup in the community-meetups.json file to reflect the new name and URL.
• The title was changed from "Jeju Blockchain Meetup" to "Ethereum Jeju".
• The link was updated from "https://www.meetup.com/Jeju-Blockchain-Meetup" to "https://www.meetup.com/Ethereum-Jeju".

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