deps: Drop python 3.8 #6878

Job	Run time
pytest-ubuntu-py311-gcc11-noomp-base	50m 32s
pytest-ubuntu-py311-gcc11-noomp-adjoint	38m 6s
pytest-ubuntu-py312-gcc12-omp-base	1h 7m 17s
pytest-ubuntu-py312-gcc12-omp-adjoint	49m 28s
pytest-ubuntu-py39-gcc7-omp-base	50m 21s
pytest-ubuntu-py39-gcc7-omp-adjoint	37m 23s
pytest-ubuntu-py310-gcc10-noomp-base	50m 9s
pytest-ubuntu-py310-gcc10-noomp-adjoint	38m 23s
pytest-ubuntu-py312-gcc13-omp-base	1h 5m 33s
pytest-ubuntu-py312-gcc13-omp-adjoint	47m 39s
pytest-ubuntu-py39-gcc9-omp-base	50m 15s
pytest-ubuntu-py39-gcc9-omp-adjoint	37m 38s
pytest-osx-py312-clang-omp-base	42m 45s
pytest-docker-py39-gcc-omp-base	44m 53s
pytest-docker-py39-gcc-omp-adjoint	33m 11s
pytest-docker-py39-icx-omp-base	37m 36s
pytest-docker-py39-icx-omp-adjoint	33m 35s
	12h 54m 44s

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