fix dependencies in docs build

[edknv]

docs-build in the CI is failing due to pip failing to resolve dependencies, e.g.,

Collecting nbformat~=5.0 (from myst-nb->-r requirements/docs.txt (line 4))
  Downloading nbformat-5.9.1-py3-none-any.whl.metadata (3.3 kB)
INFO: pip is still looking at multiple versions of pydata-sphinx-theme to determine which version is compatible with other requirements. This could take a while.
INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. See https://pip.pypa.io/warnings/backtracking for guidance. If you want to abort this run, press Ctrl + C.
INFO: pip is still looking at multiple versions of sqlalchemy to determine which version is compatible with other requirements. This could take a while.
INFO: This is taking longer than usual. You might need to provide the dependency resolver with stricter constraints to reduce runtime. See https://pip.pypa.io/warnings/backtracking for guidance. If you want to abort this run, press Ctrl + C.

This PR fixes package versions in requirements/docs.txt to help the dependency resolver. It also replaces test.txt with dev.txt since the requirements in the latter are narrower and dev.txt doesn't install the unnecessary requirements that cause conflicts.

[github-actions]

Documentation preview

https://nvidia-merlin.github.io/models/review/pr-1236