use Go version from go mod #64

Job	Run time
test (framework)	2m 12s
test (parrot)	1m 54s
test (wasp)	4m 16s
test (seth)	2m 44s
test (havoc)	3m 13s
test (k8s-test-runner)	2m 46s
test (lib)	4m 7s
test (tools/workflowresultparser)	1m 38s
test (tools/asciitable)	1m 52s
test (tools/ghlatestreleasechecker)	1m 36s
test (tools/testlistgenerator)	1m 41s
test (tools/ecrimagefetcher)	1m 44s
test (tools/gotestloghelper)	1m 38s
	31m 21s

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