Bump yaml to 2.5.1

[rak-phillip]

Summary

This bumps yaml to 2.5.1

Fixes #12090

Areas or cases that should be tested

It looks like this dependency is only used in pkg/harvester-manager/machine-config/harvester.vue

Areas which could experience regressions

• pkg/harvester-manager/machine-config/harvester.vue

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
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• The PR has been self reviewed
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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
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[torchiaf]

I'm working on it.

[torchiaf]

LGTM, the YAML dependency is used to handle the User Data field as a yaml.
I didn't find any regression testing that field in Harvester creation page.