chore(deps): update centos docker tag to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
centos	final	major	7 -> 8

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[ti-chi-bot]

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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]

/close
we can not upgrade it, the upgrading will break the compatibility.

[renovate]

Renovate Ignore Notification

Because you closed this PR without merging, Renovate will ignore this update. You will not get PRs for any future 8.x releases. But if you manually upgrade to 8.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.