ARROW-11685: [C++] Fix typo: FutureStessTest -> FutureStressTest
ARROW-11685: [C++] Fix typo: FutureStessTest -> FutureStressTest

Closes #9522 from mrkn/ARROW-11685

Authored-by: Kenta Murata <670e9150005b59ef8f474f17f131baf296790b4a@mrkn.jp>
Signed-off-by: Antoine Pitrou <9359a4d812173b65a3a0094cd86363e79731a3c2@python.org>

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