Update cimg/openjdk Docker tag to v21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cimg/openjdk	docker	major	17.0-browsers -> 21.0-browsers

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[github-actions]

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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 21.x releases. But if you manually upgrade to 21.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.