pdutil: fix retry reusing body reader (#48312)#48317

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ti-chi-bot wants to merge 1 commit intopingcap:release-6.1from ti-chi-bot:cherry-pick-48312-to-release-6.1

+317-7

Commits on Nov 6, 2023

This is an automated cherry-pick of pingcap#48312

D3Hunter
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