[to #43554786]fix: test error is not detected in gate test, protobuf version to (3, 3.21.0) for tensorflow

限制protobuf版本，修复单元测试有error返回值为0问题
        Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/9510263

    * fix test error is not detected in gate test, protobuf version to (3, 3.21.0)

requirements/audio.txt

@@ -9,8 +9,8 @@ lxml
 matplotlib
 nara_wpe
 numpy<=1.18
-# tested on version before 3.20, expecting no breaking change going forward
-protobuf>3
+# protobuf version beyond 3.20.0 is not compatible with TensorFlow 1.x, therefore is discouraged.
+protobuf>3,<3.21.0
 ptflops
 pytorch_wavelets
 PyWavelets>=1.0.0

requirements/runtime.txt

@@ -6,8 +6,6 @@ filelock>=3.3.0
 numpy
 opencv-python
 Pillow>=6.2.0
-# tested on version before 3.20, expecting no breaking change going forward
-protobuf>3
 pyyaml
 requests
 scipy

tests/run.py

@@ -49,7 +49,9 @@ def main(args):
     if not args.list_tests:
         result = runner.run(test_suite)
         if len(result.failures) > 0:
-            sys.exit(1)
+            sys.exit(len(result.failures))
+        if len(result.errors) > 0:
+            sys.exit(len(result.errors))
 
 
 if __name__ == '__main__':