Fast-sentence-transformers

**Full Changelog**: https://github.com/davidberenstein1957/fast-sentence-transformers/compare/0.4.1...0.5.0

Resolve AttributeError: 'str' object has no attribute 'SerializeToString' by removing SerializeToString() call.

allow for mac m1 serialization
https://github.com/microsoft/onnxruntime/pull/800#issuecomment-844326099
https://github.com/Pandora-Intelligence/classy-classification/issues/14