update golang to 1.26.0 / alpine to 3.23.3 #219

Job	Run time
valitail / build (arm64, ubuntu-24.04-arm)	1m 47s
valitail / build (x86_64, ubuntu-24.04)	2m 3s
vali-build-image / build (arm64, ubuntu-24.04-arm)	1m 31s
vali-build-image / build (x86_64, ubuntu-24.04)	1m 31s
vali / build (x86_64, ubuntu-24.04)	1m 47s
vali / build (arm64, ubuntu-24.04-arm)	1m 46s
vali-build-image / merge	13s
vali / merge	20s
valitail / merge	16s
	11m 14s

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