Update BS_thread_pool_light.hpp to version 3.5.0 #2269

Job	Run time
build-and-test-cpp-aarch64 (openblas)	8m 36s
build-and-push-docker-images	32m 44s
check-python-style	14s
build-python-wheels (ubuntu-20.04, auto64)	37m 24s
build-python-wheels (macos-11, auto64)	49m 13s
build-python-wheels (windows-2019, auto64)	53m 11s
build-python-wheels (ubuntu-20.04, aarch64)	2h 3m 22s
build-python-wheels (macos-11, arm64)	12m 49s
build-and-test-cpp-x86_64 (ubuntu-20.04, mkl)	6m 54s
build-and-test-cpp-x86_64 (ubuntu-20.04, dnnl)	6m 13s
build-and-test-cpp-x86_64 (macos-11, mkl)	10m 23s
build-and-test-cpp-x86_64 (macos-11, dnnl)	12m 7s
build-and-deploy-docs	44s
test-python-wheels (ubuntu-20.04)	11m 18s
test-python-wheels (macos-11)	7m 29s
test-python-wheels (windows-2019)	3m 53s
publish-python-wheels-on-pypi	0s
	6h 16m 34s

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