Update module yaml to v2.4.0

This MR contains the following updates:

Package	Type	Update	Change
gopkg.in/yaml.v2	require	minor	v2.2.1 -> v2.4.0

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Release Notes

go-yaml/yaml

v2.4.0

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v2.3.0

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v2.2.8

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v2.2.7

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v2.2.6

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v2.2.5

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v2.2.4

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v2.2.3

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v2.2.2

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