CU-2uhvm87 Pin dill version to less than 0.3.5 to satisfy datasets requirement

[mart-r]

The docs builds have been failing due to the incompatible version of dill that gets installed (incompatible with datasets).

I've gone ahead and pinned dill to a version less than 0.3.5 (the requirement from datasets) so that 0.3.4 gets installed.

This should fix the issue for the docs.

What I tried to make sure this fixes the issue:

• Run the below on python 3.9.14
  • Though readthedocs runs 3.9.13, it should be close enough
• Install dill==0.3.5.1 (as is installed on readthedocs)
  • Run python ./setup.py install --force (as is done on readthedocs)
  • Experience an error due to the mismatch (similarly to readthedocs)
• Install dill==0.3.4
  • Run python ./setup.py install --force
  • Experience no errors