revert changes to the mnnpy component since it requires python:3.8 #3916

Job	Run time
list	1m 39s
viash_test (common/create_component, /home/runner/work/openproblems-v2/openproblems-v2/src/common...	54s
viash_test (common/process_task_results/get_metric_info, /home/runner/work/openproblems-v2/openpr...	1m 40s
viash_test (common/process_task_results/get_method_info, /home/runner/work/openproblems-v2/openpr...	1m 18s
viash_test (common/process_task_results/yaml_to_json, /home/runner/work/openproblems-v2/openprobl...	1m 23s
viash_test (common/process_task_results/get_task_info, /home/runner/work/openproblems-v2/openprob...	1m 17s
viash_test (common/process_task_results/get_dataset_info, /home/runner/work/openproblems-v2/openp...	1m 27s
viash_test (common/create_task_readme, /home/runner/work/openproblems-v2/openproblems-v2/src/comm...	2m 39s
viash_test (batch_integration/methods/mnnpy, /home/runner/work/openproblems-v2/openproblems-v2/sr...	2m 59s
	15m 16s

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