fix(CI): use pinned deps for CI testing

[jon-tow]

Use the pinned dependencies in requirements.txt for unit testing in CI re discussion in the recent trlx meeting.

[maxreciprocate]

Thanks Jon! I've checked dependencies used on CI to be the same as in requirements, and since the build passes that means it's all good!

[maxreciprocate]

This would get later overwritten by

torch==2.0.0+cu117

from requirements.txt

Build log:

Collecting torch==2.0.0+cu117
  Downloading https://download.pytorch.org/whl/cu117/torch-2.0.0%2Bcu117-cp38-cp38-linux_x86_64.whl (1843.9 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 1.8/1.8 GB 699.2 kB/s eta 0:00:00

[jon-tow]

Oh huh. Running pip install -r requirements.txt locally I get:

ERROR: Could not find a version that satisfies the requirement torch==2.0.0+cu117 (from versions: 1.11.0, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 2.0.0)
ERROR: No matching distribution found for torch==2.0.0+cu117

I guess the CI hosts have CUDA/GPU support? I'll remove the lone pip install torch!

[jon-tow]

Thanks for the review Max!