Update conda dev env

[benjeffery]

These had got badly out of date, thanks @agladstein

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.86%. Comparing base (53f7555) to head (3f9773d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3084   +/-   ##
=======================================
  Coverage   89.86%   89.86%           
=======================================
  Files          29       29           
  Lines       32157    32157           
  Branches     5768     5768           
=======================================
  Hits        28897    28897           
  Misses       1859     1859           
  Partials     1401     1401           

Flag	Coverage Δ
c-tests	86.71% <ø> (ø)
lwt-tests	80.78% <ø> (ø)
python-c-tests	89.05% <ø> (ø)
python-tests	98.98% <ø> (ø)

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[agladstein]

Was able to successfully install reqs with mamba env create -f python/requirements/development.yml --verbose.
I was able to run make from within the python dir and then import tskit and msprime. I was also able to make from the docs dir, but got an error (the same as shown in the GitHub Build Docs error) - I assume unrelated to the env.

[benjeffery]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased