Build fails with Go 1.26

[stefanb]

Feature Request

Is your feature request related to a problem? Please describe:

Trying to build tidb with Go 1.26 (rc2) fails with
panic: The hack package only supports go1.25, please confirm the correctness of the ABI before upgrading

Describe the feature you'd like:

Buildable with Go 1.26, eg in

• go 1.26rc2, go@1.25 1.25.6 (new formula) Homebrew/homebrew-core#258912

Describe alternatives you've considered:

Pinning Go to 1.25 even after 1.26 is released.

Teachability, Documentation, Adoption, Migration Strategy:

It fails at check:

tidb/pkg/util/hack/map_abi.go

Lines 409 to 413 in e9c1bbb

	func checkMapABI() {
	if !strings.Contains(runtime.Version(), `go1.25`) {
	panic("The hack package only supports go1.25, please confirm the correctness of the ABI before upgrading")
	}
	}

which was introduced in recent

• *: upgrade golang to 1.25.5 #63475