Avoid using `xcm::v4` and use latest instead for AssetHub benchmarks #655

Job	Run time
set-image	10s
check-dependency-rules	10s
check-markdown	21s
check-workspace	16s
fmt	1m 23s
check-rust-feature-propagation	2m 1s
test-rust-features	2m 10s
check-toml-format	1m 20s
check-umbrella	3m 22s
	11m 13s

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