Unpin timm and pyarrow

[weiji14]

Resolves some dependency conflicts reported at #309.

LibMambaUnsatisfiableError: Encountered problems while solving:
  - package torchgeo-0.5.2-pyhd8ed1ab_0 requires segmentation-models-pytorch >=0.2, but none of the providers can be installed
  - package pylance-0.14.1-py311h6a0c370_0 requires pyarrow >=12,<15.0.1, but none of the providers can be installed

The refreshed conda-lock.yml file is generated using:

conda-lock lock --mamba --file environment.yml --with-cuda=12.0

TODO:

• [x] Unpin timm and use what torchgeo -> smp uses (xref https://github.com/conda-forge/segmentation-models-pytorch-feedstock/pull/22#discussion_r1511659865)
• [x] Unpin pyarrow and use what lancedb -> pylance uses
• [x] Re-lock for osx-64 and osx-arm64 again (undo-ing change in #264)

Fixes #309.