use sodiumoxide for mlock #127

Job	Run time
test_rust (ubuntu-latest)	1m 45s
test_py_linux (3.7)	1m 33s
test_rust (macos-latest)	2m 6s
test_py_linux (3.8)	1m 1s
test_rust (windows-latest)	1m 54s
test_py_linux (3.9)	1m 18s
Check version	11s
test_py_linux (3.10)	1m 34s
test_py_macos (3.8)	1m 33s
test_py_linux (3.11)	1m 4s
test_py_macos (3.9)	1m 21s
test_py_windows (3.7)	1m 19s
test_py_linux (3.12)	1m 34s
test_py_macos (3.10)	1m 12s
test_py_windows (3.8)	1m 23s
test_py_macos (3.11)	1m 4s
test_py_windows (3.9)	1m 25s
test_py_windows (3.10)	1m 24s
test_py_macos (3.12)	1m 7s
test_py_windows (3.11)	1m 21s
test_py_windows (3.12)	1m 25s
build_macos	0s
build_linux	0s
build_sdist	0s
build_windows	0s
Create release and publish to PyPI	0s
	28m 34s

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