Update rand_xorshift requirement from 0.4.0 to 0.5.0 #460

Job	Run time
msrv	16s
cargo-doc	30s
run_all_examples	21s
test_all_features	47s
build_and_test (ubuntu-latest)	35s
build_and_test (macos-latest)	38s
build_and_test (windows-latest)	38s
	3m 45s

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