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ARROW-14699: [C++] Fix lz4 undefined behaviour issues

LZ4 got a bunch of undefined behaviour fixes on its development branch, bump the bundled version.

Closes #11713 from pitrou/ARROW-14699-lz4-sanitize

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>