ci: use go.mod to determine go version #7239

Job	Run time
setup	4s
Run Main (github-bot) / Go Linter / lint	21s
Run Main (gnodev) / Go Linter / lint	33s
Run Main (github-bot) / Go Build / generated	15s
Run Main (github-bot) / Go Test / test	12s
Run Main (gnodev) / Go Build / generated	9s
Run Main (gnofaucet) / Go Build / generated	7s
Run Main (gnodev) / Go Test / test	56s
Run Main (gnofaucet) / Go Linter / lint	23s
Run Main (gnofaucet) / Go Test / test	18s
Run Main (gnogenesis) / Go Build / generated	10s
Run Main (gnogenesis) / Go Linter / lint	20s
Run Main (gnogenesis) / Go Test / test	30s
Run Main (gnohealth) / Go Build / generated	5s
Run Main (gnohealth) / Go Linter / lint	17s
Run Main (gnohealth) / Go Test / test	16s
Run Main (gnokeykc) / Go Build / generated	9s
Run Main (gnokeykc) / Go Linter / lint	27s
Run Main (gnokeykc) / Go Test / test	18s
Run Main (gnomd) / Go Linter / lint	24s
Run Main (gnomd) / Go Build / generated	6s
Run Main (gnomd) / Go Test / test	22s
Run Main (gnomigrate) / Go Build / generated	7s
Run Main (gnomigrate) / Go Linter / lint	14s
Run Main (gnomigrate) / Go Test / test	26s
	7m 29s

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