*: upgrade go version to v1.25.6 to avoid security vulnerabilities (#1080)#1083

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ti-chi-bot wants to merge 1 commit intopingcap:release-1.3from

ti-chi-bot:cherry-pick-1080-to-release-1.3

Commits on Feb 9, 2026

This is an automated cherry-pick of #1080

djshow832
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