Update cpp/cmake/thirdparty/get_gtest.cmake #14678

Job	Run time
checks / check-style	2m 28s
checks / other-checks	57s
devcontainer / build (amd64, 12.5, conda)	13m 32s
devcontainer / build (amd64, 12.5, pip)	12m 17s
wheel-build-cudf	0s
conda-cpp-build	0s
static-configure	0s
wheel-tests-cudf	0s
unit-tests-cudf-pandas	0s
wheel-build-cudf-polars	0s
wheel-build-dask-cudf	0s
pandas-tests	0s
conda-cpp-checks	0s
conda-cpp-tests	0s
conda-python-build	0s
conda-java-tests	0s
wheel-tests-cudf-polars	0s
conda-python-cudf-tests	0s
conda-python-other-tests	0s
conda-notebook-tests	0s
docs-build	0s
pandas-tests-diff	0s
wheel-tests-dask-cudf	0s
pr-builder	0s
	29m 14s

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