[ko] Update kubectl Linux package repository instructions

[nAhYUN22]

Description

Updates the Korean translation of content/ko/docs/tasks/tools/install-kubectl-linux.md
to use the current pkgs.k8s.io package repositories for Debian-based and
Red Hat-based distributions.

This updates the outdated apt.kubernetes.io and packages.cloud.google.com
references to match the latest English documentation.

Issue

Closes: #56888

/area localization
/language ko

This PR was written in part with the assistance of generative AI.

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[linux-foundation-easycla]

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[callme-waffle]

Thanks for updating the package repository URLs. The continuation lines 124–125, and the corresponding lines 132–133, need the same three-space indentation as the surrounding fenced code blocks. In the Netlify preview, the first fence closes after the curl line: the pipe and chmod commands render as paragraph text, and step 3 is displayed inside an unhighlighted code block. Please indent all four lines by three spaces.

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124–125줄과 동일한 형태의 132–133줄은 주변의 펜스 코드 블록과 마찬가지로 공백 세 칸으로 들여써야 합니다.
현재 Netlify 미리보기에서는 첫 번째 코드 블록이 curl 줄 다음에서 끝나 | 파이프와 chmod 명령이 일반 문단으로 렌더링되고, 3번 단계는 구문 강조가 없는 코드 블록 안에 표시됩니다.

네 줄 모두 앞에 공백 세 칸을 추가해 주실 수 있나요?