Bump protobuf version to >=3.20.2

[Rusteam]

I'm using onnx packages and lightning-flash in the same project but I hit this inconsistent dependency issue with protobuf. Can we update its version to >=3.20.2?

My error with poetry:

Because no versions of onnx match >1.13.1,<2.0.0
 and onnx (1.13.1) depends on protobuf (>=3.20.2,<4), onnx (>=1.13.1,<2.0.0) requires protobuf (>=3.20.2,<4).
And because lightning-flash (0.8.1.post0) depends on protobuf (<=3.20.1)
 and no versions of lightning-flash match >0.8.1.post0,<0.9.0, onnx (>=1.13.1,<2.0.0) is incompatible with lightning-flash (>=0.8.1.post0,<0.9.0).
So, because finegrained depends on both lightning-flash (^0.8.1.post0) and onnx (^1.13.1), version solving failed.