Update docker/login-action action to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
docker/login-action	action	major	v3	source

Test plan: CI should pass with updated dependencies. No review required: this is an automated dependency update PR.

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Release Notes

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

v3

Compare Source

v2

Compare Source

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 3.x releases. But if you manually upgrade to 3.x then Renovate will re-enable minor and patch updates automatically.

If you accidentally closed this PR, or if you changed your mind: rename this PR to get a fresh replacement PR.