v5.4: update download URL from pingcap.org to pingcap.com

[Oreoxmt]

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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-08 10:11:57.436759065 +0000 UTC m=+869873.255067497: ☑️ agreed by lilin90.

[Oreoxmt]

/unhold

[Oreoxmt]

/approve

[ti-chi-bot]

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