Upgrade Go toolchain to 1.25

[tuhaihe]

• CI workflow: GO_VERSION 1.24 -> 1.25
• Dockerfile: GO_VERSION 1.24.0 -> 1.25.0
• go.mod: go 1.24 -> go 1.25
• Documentation: Update minimum Go version requirement

closes: #ISSUE_Number

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[ostinru]

Looks good. Re-triggered tests. There was some new error... probably flap.

[MisterRaindrop]

LGTM