chore: Port away from gopkg.in/yaml.v3

[mrueg]

What this PR does / why we need it:
gopkg.in/yaml.v3 is deprecated by upstream and we can use sigs.k8s.io/yaml now.

How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality)
None
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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