jayesh-srivastava: Update go version to 1.18.1

JobBuild
580
06-07 13:31
pull-cluster-api-provider-gcp-apidiff 1534503328535285760 1534166224945025024
pull-cluster-api-provider-gcp-build 1534503328405262336 1534166224798224384
pull-cluster-api-provider-gcp-e2e-test 1534503328501731328 1534166224903081984
pull-cluster-api-provider-gcp-make 1534503328438816768 1534166224831778816
pull-cluster-api-provider-gcp-test 1534503328375902208 1534166224764669952
pull-cluster-api-provider-gcp-verify 1539292978860789760 1534503328472371200 1534166224873721856