upgrade gtest to 1.15.2 (#760) #1131

Job	Run time
set_matrix	6s
GTest clang-cxx17 ubuntu-20.04	2m 29s
GTest gcc-7-cxx17 ubuntu-20.04	2m 31s
GTest gcc-8-cxx17-fpic ubuntu-20.04	50m 26s
GTest gcc-9-cxx17-fpic ubuntu-20.04	2m 54s
GTest android-ndk-r17-api-24-arm64-v8a-clang-libcxx14 ubuntu-20.04	3m 10s
GTest analyze-cxx17 ubuntu-20.04	1h 10m 41s
GTest sanitize-address-cxx17 ubuntu-20.04	2m 23s
GTest sanitize-leak-cxx17 ubuntu-20.04	2m 44s
GTest sanitize-thread-cxx17 ubuntu-20.04	2m 27s
GTest osx-12-3-arch-universal2-cxx17 macos-12	1h 31m 19s
GTest ios-nocodesign-15-5-arm64-cxx17 macos-12	53m 18s
GTest ninja-vs-16-2019-win64-cxx17 windows-2019	3m 38s
GTest nmake-vs-16-2019-win64-cxx17 windows-2019	1h 30m 38s
GTest vs-16-2019-win64-sdk-10-0-18362-0-cxx17 windows-2019	4m 22s
GTest vs-16-2019-win64-store-10-cxx17 windows-2019	4m 47s
GTest mingw-cxx17 windows-2019	3m 51s
GTest msys-cxx17 windows-2019	31m 57s
set_status	5s
	7h 3m 46s

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