Upgrade protobuf to 5.28.2 in maven_test, too

Author: dongjoon-hyun

.github/workflows/maven_test.yml

@@ -178,7 +178,7 @@ jobs:
  - name: Install Python packages (Python 3.11)
  if: (contains(matrix.modules, 'sql#core')) || contains(matrix.modules, 'connect')
  run: |
- python3.11 -m pip install 'numpy>=1.20.0' pyarrow pandas scipy unittest-xml-reporting 'grpcio==1.67.0' 'grpcio-status==1.67.0' 'protobuf==4.25.1'
+ python3.11 -m pip install 'numpy>=1.20.0' pyarrow pandas scipy unittest-xml-reporting 'grpcio==1.67.0' 'grpcio-status==1.67.0' 'protobuf==5.28.2'
  python3.11 -m pip list
  # Run the tests.
  - name: Run tests