[to #43726282] fix multi-model requirements missing

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9615507

setup.py

@@ -176,6 +176,7 @@ if __name__ == '__main__':
     for field in dir(Fields):
         if field.startswith('_'):
             continue
+        field = getattr(Fields, field)
         extra_requires[field], _ = parse_requirements(
             f'requirements/{field}.txt')