Update protobuf requirement from <=3.20.0,>=3.1.0 to >=3.1.0,<=4.22.1 (#119)

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.1.0...v4.22.1)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
...

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requirements.txt

@@ -17,7 +17,7 @@ openpyxl
 # paddlepaddle-gpu >= 2.2.0
 paddleslim >= 2.2.1, < 2.3.5
 pandas
-protobuf >= 3.1.0, <= 3.20.0
+protobuf >= 3.1.0, <= 4.22.1
 pycocotools
 # pydensecrf
 scikit-learn