Update dependency yaml to v2.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yaml (source)	2.4.1 -> 2.6.0

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Release Notes

eemeli/yaml (yaml)

v2.6.0

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• Use a proper tag for !!merge << keys (#​580)
• Add stringKeys parse option (#​581)
• Stringify a Document as a Document (#​576)
• Add sponsorship by Manifest

v2.5.1

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• Include range in flow sequence pair maps (#​573)

v2.5.0

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• Add --indent option to CLI tool (#​559, with thanks to @​danielbayley)
• Require newline in all cases for props on block sequence (#​557)
• Always reset indentation in lexer on ... (#​558)
• Ignore minContentWidth if greater than lineWidth (#​562)
• Drop unused Collection.maxFlowStringSingleLineLength (#​522, #​421)

v2.4.5

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• Improve tab handling (#​553, yaml-test-suite tests DK95 & Y79Y)

v2.4.4

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With special thanks to @​RedCMD for finding and reporting all of the following:

• Allow comment after top-level block scalar with explicit indent indicator (#​547)
• Allow tab as indent for line comments before nodes (#​548)
• Do not allow tab before block collection (#​549)
• In flow collections, allow []{} immediately after : with plain key (#​550)
• Require indentation for ? explicit-key contents (#​551)
• Require indentation from block scalar header & flow collections in mapping values (#​553)

v2.4.3

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• Improve error when parsing a non-string value (#​459)
• Do not parse -.NaN or +.nan as NaN (#​546)
• Support # within %TAG prefixes with trailing #comments
• Check for non-node complex keys when stringifying with simpleKeys (#​541)

v2.4.2

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• Restrict YAML 1.1 boolean strings to their explicit capitalization (#​530)
• Add sponsorship by Scipress (#​536)

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