input: Write a python function to filter OSU providers by a specific method.
  assert filter_osu_providers_by_method([{'name': 'provider1', 'osu_method': 'oma-dm'}, {'name': 'provider2', 'osu_method': 'soap-xml-spp'}], 'oma-dm') == [{'name': 'provider1', 'osu_method': 'oma-dm'}]
  assert filter_osu_providers_by_method([{'name': 'provider1', 'osu_method': 'oma-dm'}, {'name': 'provider2', 'osu_method': 'soap-xml-spp'}], 'soap-xml-spp') == [{'name': 'provider2', 'osu_method': 'soap-xml-spp'}]
  assert filter_osu_providers_by_method([], 'oma-dm') == []
output: def filter_osu_providers_by_method(providers, method):
      return [provider for provider in providers if provider['osu_method'] == method]