REFACTOR-#000: Format code to be in line with latest black #840

Job	Run time
lint (flake8)	6s
lint (black)	7s
test-ubuntu (backend ray, python 3.8)	2m 37s
test-ubuntu (backend mpi, python 3.8)	2m 4s
test-ubuntu (backend dask, python 3.8)	2m 5s
test-ubuntu (backend pymp, python 3.8)	1m 46s
test-ubuntu (backend pyseq, python 3.8)	1m 44s
test-ubuntu (backend ray, python 3.9)	2m 7s
test-ubuntu (backend mpi, python 3.9)	2m 5s
test-ubuntu (backend dask, python 3.9)	2m 10s
test-ubuntu (backend pymp, python 3.9)	1m 44s
test-ubuntu (backend pyseq, python 3.9)	1m 42s
test-windows (backend ray, python 3.8)	4m 28s
test-windows (backend mpi, python 3.8)	5m 40s
test-windows (backend dask, python 3.8)	5m 58s
test-windows (backend pymp, python 3.8)	5m 31s
test-windows (backend pyseq, python 3.8)	4m 56s
test-windows (backend ray, python 3.9)	5m 31s
test-windows (backend mpi, python 3.9)	5m 24s
test-windows (backend dask, python 3.9)	5m 31s
test-windows (backend pymp, python 3.9)	5m 7s
test-windows (backend pyseq, python 3.9)	4m 47s
	1h 13m 10s

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