chore: update deprecated domain name

[purelind]

update deprecated domain name

[ti-chi-bot[bot]]

I have already done a preliminary review for you, and I hope to help you do a better job.

Key Changes:

• The deprecated domain name hub-new.pingcap.net has been replaced by hub.pingcap.net in the Docker image pull commands.

Potential Problems:

• None observed.

Fixing Suggestions:

• The changes look good and they should be merged to the master branch.

[ti-chi-bot[bot]]

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