[renovate] Update module github.com/openconfig/ygot to v0.29.21

This MR contains the following updates:

Package	Type	Update	Change
github.com/openconfig/ygot	require	patch	v0.29.20 -> v0.29.21

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go.mod

@@ -14,7 +14,7 @@ require (
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/openconfig/gnmi v0.13.0
 	github.com/openconfig/goyang v1.6.0
-	github.com/openconfig/ygot v0.29.20
+	github.com/openconfig/ygot v0.29.21
 	github.com/prometheus/client_golang v1.20.5
 	github.com/pterm/pterm v0.12.80
 	github.com/sethvargo/go-password v0.3.1