Update dependency yaml to v2.8.1

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This PR contains the following updates:

Package	Change	Age	Confidence
yaml (source)	2.7.0 -> 2.8.1

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Release Notes

eemeli/yaml (yaml)

v2.8.1

Compare Source

• Preserve empty block literals (#​634)

v2.8.0

Compare Source

• Add node cache for faster alias resolution (#​612)
• Re-introduce compatibility with Node.js 14.6 (#​614)
• Add --merge option to CLI tool (#​611)
• Improve error for tag resolution error on null value (#​616)
• Allow empty string as plain scalar representation, for failsafe schema (#​616)
• docs: include cli example (#​617)

v2.7.1

Compare Source

• Do not allow seq with single-line collection value on same line with map key (#​603)
• Improve warning & avoid TypeError on bad YAML 1.1 nodes (#​610)

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