Replace deprecated Cobra command.SetOutput() with command.SetOut()

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/system/version_test.go

@@ -21,7 +21,7 @@ func TestVersionWithoutServer(t *testing.T) {
 		},
 	})
 	cmd := NewVersionCommand(cli)
-	cmd.SetOutput(cli.Err())
+	cmd.SetOut(cli.Err())
 	assert.ErrorContains(t, cmd.Execute(), "no server")
 	out := cli.OutBuffer().String()
 	// TODO: use an assertion like e2e/image/build_test.go:assertBuildOutput()