🌐 [i18n-KO] Translated `package_reference/webhooks_server.md` to Korean

[fabxoe]

What does this PR do?

Translated the package_reference/webhooks_server.md file of the documentation to Korean. Thank you in advance for your review.

Part of https://github.com/huggingface/huggingface_hub/issues/1626

Before reviewing

• [x] Check for missing / redundant translations (번역 누락/중복 검사)
• [x] Grammar Check (맞춤법 검사)
• [x] Review or Add new terms to glossary (용어 확인 및 추가)
• [x] Check Inline TOC (e.g. [[lowercased-header]])
• [x] Check live-preview for gotchas (live-preview로 정상작동 확인)

Who can review? (Initial)

Team Hugging Face KREW, may you please review this PR? @harheem, @cjfghk5697, @seoulsky-field, @nuatmochoi, @boyunJang, @SeungAhSon, @seoyoung-3060, @junejae, @usr-bin-ksh, @fabxoe

Before submitting

• [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• [x] Did you read the contributor guideline, Pull Request section?
• [ ] Was this discussed/approved via a Github issue or the forum? Please add a link to it if that's the case.
• [x] Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• [ ] Did you write any new necessary tests?

Who can review? (Final)

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[jungnerd]

@Wauplin I reviewed this PR and think it's good to be merged!

[Wauplin]

Great, thanks!