feat: upgrades dockerfile to python3.10-slim (#189) #592

Job	Run time
unit_tests (3.7)	5m 0s
unit_tests (3.8)	4m 42s
unit_tests (3.9)	5m 14s
docker_build_tests / docker_build_tests	1h 4m 55s
py_build_tests / py_build_tests	9s
py_build_tests / relative_path_tests	10s
	1h 20m 10s

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