Bump C++ client to 3.8.0 #304

Job	Run time
Run unit tests for Python 3.13	2m 31s
Lint and check code	23s
Run unit tests for Python 3.9	49m 31s
Wheel ${{ matrix.image.name }} - Py ${{ matrix.python.version }} - ${{ matrix.cpu.platform }}	1s
Check Completion	4s
Wheel MacOS Universal2 - Py ${{ matrix.py.version }}	1s
Python ${{ matrix.python.version }} Wheel on Windows x64	1s
Run unit tests for Python 3.9	24m 23s
Run unit tests for Python 3.13	2m 31s
Lint and check code	23s
Wheel MacOS Universal2 - Py ${{ matrix.py.version }}	1s
Python ${{ matrix.python.version }} Wheel on Windows x64	1s
Wheel ${{ matrix.image.name }} - Py ${{ matrix.python.version }} - ${{ matrix.cpu.platform }}	1s
Check Completion	3s
Run unit tests for Python 3.9	2m 28s
Lint and check code	23s
Run unit tests for Python 3.13	2m 31s
Wheel MacOS Universal2 - Py 3.13	4m 2s
Wheel manylinux - Py 3.13 - x86_64	15m 3s
Wheel manylinux_musl - Py 3.13 - x86_64	4m 2s
Python 3.12 Wheel on Windows x64	2m 10s
Check Completion	2s
	1h 50m 36s

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