Update module yaml to v2.4.0

This MR contains the following updates:

Package	Type	Update	Change
gopkg.in/yaml.v2	require	minor	v2.3.0 -> v2.4.0

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Release Notes

go-yaml/yaml

v2.4.0

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go.mod

@@ -20,5 +20,5 @@ require (
 	github.com/tstranex/u2f v1.0.0
 	go.opencensus.io v0.22.5
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
-	gopkg.in/yaml.v2 v2.3.0
+	gopkg.in/yaml.v2 v2.4.0
 )