ci: use Go 1.25.7 (#6739)#6740

csuzhangxc merged 2 commits intopingcap:release-1.6pingcap/tidb-operator:release-1.6from

ti-chi-bot:cherry-pick-6739-to-release-1.6ti-chi-bot/tidb-operator:cherry-pick-6739-to-release-1.6Copy head branch name to clipboard