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[29.x backport] update to go1.25.8 #8859

Job	Run time
tests (local, debian, 25)	3m 32s
tests (connhelper-ssh, debian, 28)	3m 51s
tests (connhelper-ssh, alpine, 25)	4m 1s
tests (connhelper-ssh, debian, rc)	3m 56s
tests (connhelper-ssh, alpine, 28)	3m 48s
tests (local, alpine, 28)	3m 41s
tests (connhelper-ssh, debian, 29)	3m 46s
tests (local, debian, 29)	3m 27s
tests (local, alpine, rc)	3m 34s
tests (local, debian, rc)	3m 43s
tests (local, alpine, 29)	3m 24s
tests (connhelper-ssh, debian, 25)	3m 37s
tests (connhelper-ssh, alpine, 29)	3m 55s
tests (local, debian, 28)	3m 39s
tests (connhelper-ssh, alpine, rc)	3m 47s
tests (local, alpine, 25)	3m 42s
	59m 23s

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