Update actions/upload-pages-artifact action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
actions/upload-pages-artifact	action	major	v4	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

actions/upload-pages-artifact (actions/upload-pages-artifact)

v4

Compare Source

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Configuration

📅 Schedule: Branch creation - "on the 1st through 7th day of the month" in timezone America/Los_Angeles, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ 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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• If you want to rebase/retry this PR, check this box

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[github-actions]

Test Results

24 tests  ±0   24 ✅ ±0   20m 45s ⏱️ + 17m 54s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit ff89aec. ± Comparison against base commit 1b82b22.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 4.x releases. But if you manually upgrade to 4.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.