ARROW-15728: [Python] Reduce entropy for zstd test_ipc
ARROW-15728: [Python] Reduce entropy for zstd test_ipc

Closes #12462 from emkornfield/fix_compression

Authored-by: Micah Kornfield <ee238861fc7c420e3c40e16afaa0ba8ab6b504de@google.com>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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