Fix lint in integration/client

Signed-off-by: Derek McGowan <derek@mcg.dev>

integration/client/client_windows_test.go

@@ -25,6 +25,7 @@ import (
 	_ "github.com/Microsoft/hcsshim/test/functional/manifest" // For rsrc_amd64.syso
 )
 
+//nolint:unused // some variables used for fuzz
 const (
 	defaultAddress = `\\.\pipe\containerd-containerd-test`
 )