Fix rpm golang version to match 1.15

[tnozicka]

/cc @marun

[openshift-ci-robot]

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[openshift-ci-robot]

@tnozicka: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-gcp	0eb793d	link	/test e2e-gcp
ci/prow/e2e-aws-fips	0eb793d	link	/test e2e-aws-fips
ci/prow/e2e-cmd	0eb793d	link	/test e2e-cmd
ci/prow/e2e-aws-csi	0eb793d	link	/test e2e-aws-csi
ci/prow/e2e-gcp-upgrade	0eb793d	link	/test e2e-gcp-upgrade
ci/prow/k8s-e2e-gcp-serial	0eb793d	link	/test k8s-e2e-gcp-serial
ci/prow/images	0eb793d	link	/test images
ci/prow/k8s-e2e-gcp	0eb793d	link	/test k8s-e2e-gcp
ci/prow/e2e-aws-serial	0eb793d	link	/test e2e-aws-serial

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[marun]

Thanks for taking the initiative to propose! I've already included in the 1.15 bump: #348