Update dependency yaml to v2.8.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence	Diffend
yaml (source)	2.8.3 → 2.8.4					Diff

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Release Notes

eemeli/yaml (yaml)

v2.8.4

Compare Source

• Disable alias resolution with maxAliasCount:0 (#​677)
• Handle invalid unicode escapes (e1a1a77)
• Apply minFractionDigits only to decimal strings (#​676)

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