Build patched Go 1.26 for tests #39

Job	Run time
build (windows, 386, release-branch.go1.26)	3m 51s
build (windows, amd64, release-branch.go1.26)	3m 40s
pre-cr (release-branch.go1.26)	21s
pre-ws (release-branch.go1.26)	24s
	8m 16s

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