ci: update docker/login-action action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/login-action	action	major	v3 → v4

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Release Notes

docker/login-action (docker/login-action)

v4

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[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-03-25 14:28 UTC · Rule: renovate
• ✅ Checks passed · in-place
• ✅ Merged — 2026-03-25 14:37 UTC · at 78f51a11c38539349b3dbdf0fddfc8c8f62605df

This pull request spent 8 minutes 58 seconds in the queue, including 1 minute 50 seconds running CI.

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[renovate]

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