Unify yaml dependency to sigs.k8s.io/yaml

[johnchen-k]

History There are two types of yaml libs used in the opa before v0.56.0: ghodss/yaml, gopkg.in/yaml. This pr 6195 in v0.56.0 replaces gopkg.in/yaml with sigs.k8s.io/yaml, but gopkg.in/yaml is not replaced.

Request Replace gopkg.in/yaml with sigs.k8s.io/yaml.

[stale[bot]]

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