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MINOR: [C++][CI] Work around bug in conda-forge benchmark package (#41987)

### Rationale for this change

Work around bug in version 1.8.4 of the benchmark package: https://github.com/conda-forge/benchmark-feedstock/issues/36

### Are these changes tested?

By regular CI jobs.

### Are there any user-facing changes?

No.

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>