Migrate to supported yaml parser

[sjhx]

Given https://github.com/go-yaml/yaml/blob/v3/README.md
We need to migrate to a supported library, policy suggests we treat this as a high severity vulnerability.
YMMV but https://github.com/kubernetes-sigs/yaml may be the best bet (its not a wrapper round go-yaml now).

[padamstx]

Hi Stuart, thanks for the heads up about this. We'll prioritize this and get it addressed soon.

[ibm-devx-sdk]

🎉 This issue has been resolved in version 5.19.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀