Unify golang builder images to 1.23.4-alpine3.21 #78

Job	Run time
build-alpine / Build image	2m 4s
build-buildpack / Build image	2m 21s
build-unified-agent / Build image	2m 16s
build-e2e-gcloud / Build image	5m 17s
unpack-alpine	1s
build-alpine-git-gke-aws-auth / Build image	2m 31s
build-alpine-git / Build image	1m 51s
unpack-unified-agent	1s
unpack-buildpack	1s
build-unified-agent-python / Build image	2m 2s
build-unified-agent-go / Build image	5m 20s
build-unified-agent-nodejs / Build image	2m 2s
build-buildpack-go / Build image	8m 58s
	34m 45s

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