[TESTS] Fix ONNX serialization test failures: setuptools bump + converter bug fix

### Details:
 - Bump setuptools upper bound from <80.10 to <84 to allow 80.10.x patch releases and 83.x
 - Fix wrong method call in onnx_prototxt_converter.py: serialize_proto -> deserialize_proto in the bytes branch of save_model

### Tickets:
 - N/A

Author: mvafin

src/bindings/python/constraints.txt

@@ -10,7 +10,7 @@ pytest-timeout==2.4.0
 # Python bindings
 build<1.6
 pygments>=2.8.1
-setuptools>=77,<80.10
+setuptools>=77,<84
 sympy>=1.10
 wheel>=0.38.1
 patchelf<=0.17.2.4

src/frontends/onnx/tests/onnx_prototxt_converter.py

@@ -58,7 +58,7 @@ def _get_output_file_path(path, extension):
 
 def save_model(proto, f, format=None, save_as_external_data=False, all_tensors_to_one_file=True, location=None, size_threshold=1024, convert_attribute=False):
     if isinstance(proto, bytes):
-        proto = onnx.serialization.registry.get("protobuf").serialize_proto(proto, onnx.ModelProto())
+        proto = onnx.serialization.registry.get("protobuf").deserialize_proto(proto, onnx.ModelProto())
 
     if save_as_external_data:
         convert_model_to_external_data(proto, all_tensors_to_one_file, location, size_threshold, convert_attribute)