ci: use Go 1.25.7

[csuzhangxc]

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot]

@csuzhangxc: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-e2e-kind-across-kubernetes	6ebb773	link	false	/test pull-e2e-kind-across-kubernetes
pull-e2e-kind-serial	6ebb773	link	false	/test pull-e2e-kind-serial
pull-e2e-kind-tngm	6ebb773	link	false	/test pull-e2e-kind-tngm
pull-e2e-kind-dmcluster	6ebb773	link	false	/test pull-e2e-kind-dmcluster
pull-e2e-kind-scale-simultaneously	6ebb773	link	false	/test pull-e2e-kind-scale-simultaneously
pull-e2e-kind-br	6ebb773	link	false	/test pull-e2e-kind-br
pull-e2e-kind-tidbcluster	6ebb773	link	false	/test pull-e2e-kind-tidbcluster

Full PR test history. Your PR dashboard.

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[csuzhangxc]

/cherry-pick release-1.6

[ti-chi-bot]

@csuzhangxc: new pull request created to branch release-1.6: #6740.

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In response to this:

/cherry-pick release-1.6

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