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ARROW-13978: [C++] Bump gtest to 1.11 to unbreak builds with recent clang

Closes #11139 from MarcoFalke/main

Lead-authored-by: Antoine Pitrou <antoine@python.org>
Co-authored-by: MarcoFalke <falke.marco@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>