chore(deps): update denoland/deno docker tag to v2.6.8

[renovate]

This PR contains the following updates:

Package	Update	Change
denoland/deno	patch	2.6.6 → 2.6.8

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[ti-chi-bot]

Hi @renovate[bot]. Thanks for your PR.

I'm waiting for a PingCAP-QE member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[wuhuizuo]

/ok-to-test

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wuhuizuo

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-02-05 14:50:31.285854453 +0000 UTC m=+364902.387253174: ☑️ agreed by wuhuizuo.