Update OPM dependency to allow installation with current neon-core #631

Job	Run time
unit_tests (3.7)	3m 29s
unit_tests (3.8)	3m 39s
unit_tests (3.9)	3m 45s
docker_build_tests / docker_build_tests	35m 35s
py_build_tests / py_build_tests	6s
py_build_tests / relative_path_tests	5s
	46m 39s

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