feat(tiflash): start use rocky8 as base image

[purelind]

CentOS 7 has reached the end of its life cycle. Starting from version 8.4, we began using Rocky Linux 8 as the base image.

Relate to pingcap/tiflash#9556

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[purelind]

Retest link

• pull_integration_test https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftiflash%2Fpull_integration_test/detail/pull_integration_test/1846/pipeline
• pull_unit_test https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftiflash%2Fpull_unit_test/detail/pull_unit_test/1894/pipeline

[purelind]

/hold

[Lloyd-Pottiger]

lgtm

[ti-chi-bot]

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In response to this:

lgtm

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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This pull-request has been approved by: Lloyd-Pottiger

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[purelind]

/retest

[purelind]

/unhold