Updates to setup.py and Conda environment

[jdebacker]

This PR does the following:

1. Updates setup.py to ensure that the paramtools package is installed when taxcalc is downloaded from PyPI.
2. Updates the environment.yml file (and the meta.yml file) to pin to Python version < 3.12 since there seems to be an issue with ParamTools on Python 3.12.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7610289) 98.54% compared to head (3ff655e) 98.54%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2721   +/-   ##
=======================================
  Coverage   98.54%   98.54%           
=======================================
  Files          14       14           
  Lines        2616     2616           
=======================================
  Hits         2578     2578           
  Misses         38       38           

Flag	Coverage Δ
unittests	98.54% <ø> (ø)

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