chore(deps): update cimg/openjdk docker tag to v21.0.6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cimg/openjdk	docker	major	17.0.14 -> 21.0.6
cimg/openjdk	docker	patch	21.0 -> 21.0.6
cimg/openjdk	docker	major	20.0 -> 21.0.6
cimg/openjdk	docker	major	11.0.26 -> 21.0.6

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), 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 these updates again.

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

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[renovate]

Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

⚠️ Warning: custom changes will be lost.

[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.