[ci] upgrade to GoogleTest v1.14.0 (fixes #5976) #6744

Job	Run time
Python - oldest supported versions (ubuntu-latest)	3m 31s
regular (macOS-latest, Python 3.9)	14m 39s
sdist (macOS-latest, Python 3.10)	12m 18s
bdist (macOS-latest, Python 3.7)	14m 35s
if-else (macOS-latest, Python 3.9)	4m 35s
mpi source (macOS-latest, Python 3.10)	14m 53s
mpi pip (macOS-latest, Python 3.11)	13m 40s
mpi wheel (macOS-latest, Python 3.8)	12m 16s
all-python-package-jobs-successful	3s
	1h 30m 30s

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