chore(deps): update actions/stale action to v9

[renovate]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
actions/stale	action	major	v9	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/stale (actions/stale)

v9

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v8

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v7

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v6

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v5

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Configuration

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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 9.x releases. But if you manually upgrade to 9.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.