OCM-7117 | chore: update metamodel version in sdk to v0.060

[davidleerh]

Due to data type introduced below never used in the api model ("[]Integer"):
https://github.com/openshift-online/ocm-api-model/pull/921
[]integer

the metamodel would generate an error when generating files for the SDK (via the make generate command).

output/clustersmgmt/v1/load_balancer_quota_values_client.go:162:12: expected type, found '.'
output/clustersmgmt/v1/load_balancer_quota_values_client.go:191:59: expected type, found '.'
output/clustersmgmt/v1/load_balancer_quota_values_client.go:194:6: expected declaration, found '}'
E: Can't format generated sources: exit status 2

Fix introduced in version metamodel v0.060, thanks to @mnecas
openshift-online/ocm-api-metamodel#203

[ciaranRoche]

/lgtm