deps(actions): bump actions/setup-go from 5.5.0 to 6.4.0 #756

Job	Run time
P1 - Zombie dependencies (libyear)	11s
P0 - License compliance (go-licenses)	28s
P0 - SPDX header validation (repo policy)	5s
P1 - AI hallucination guard (Lychee URL validation)	5s
Summary	4s
	53s

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