fix go mod examples

Author: rekby

examples/go.mod

@@ -53,6 +53,7 @@ require (
 	github.com/yandex-cloud/go-genproto v0.0.0-20220815090733-4c139c0154e2 // indirect
 	github.com/ydb-platform/ydb-go-genproto v0.0.0-20240528144234-5d5a685e41f7 // indirect
 	github.com/ydb-platform/ydb-go-yc-metadata v0.6.1 // indirect
+	go.uber.org/mock v0.4.0 // indirect
 	golang.org/x/crypto v0.24.0 // indirect
 	golang.org/x/mod v0.17.0 // indirect
 	golang.org/x/net v0.26.0 // indirect