Update community-events.json

[adminsuci]

We want to change our event ETHVietnam 2025 to the new date

Description

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[wackerow]

Looks good, thanks @adminsuci!

[gitpoap-bot]

Congrats, your important contribution to this open-source project has earned you a GitPOAP!

GitPOAP: 2025 Ethereum.org Contributor:

Join the [ethereum.org Discord server](https://ethereum.org/discord) to explore more ways to contribute to the project. Depending on the tasks you complete, you may also unlock additional rewards. Visit [ethereum.org/contributing](https://ethereum.org/contributing) to learn more.

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[wackerow]

@all-contributors please add @adminsuci for maintenance