Unusually large sticker file size (EuroBioC2025)

[kevinrue]

Dear @rcastelo ,

Following up on #237, I wanted to kindly flag that your sticker file events/EuroBioc2025/EuroBioC2025.png is significantly larger than most others in the repository—currently around 1.6 MB.

To maintain fairness and improve sustainability, we're aiming to bring all sticker file sizes below 500 KB, which is the case for approximately 94.4% of the stickers currently in the repo.

Would you mind resizing your sticker to bring it under that threshold?

If you're unable to do so, someone else may be able to help, but we would strongly prefer the original contributor to handle the update to avoid any concerns about the final result.

Thanks very much in advance!