[Bug] Installing latest branch of Merlin core raises error when importing cuDF

When I pull the latest branch of Merlin core and install it, I cannot import cuDF anymore.

Steps to reproduce:
- docker pull merlin-training-tensorflow:22.04
- `cd /core/ && git pull origin main && pip install .`
- python
- import cuDF

Error:
```
File cudf/_lib/gpuarrow.pyx:1, in init cudf._lib.gpuarrow()

ModuleNotFoundError: No module named 'pyarrow._cuda'
```