Move nested-lookup dependency to environment.yml to be installed from conda-forge instead of PyPi

[valeriupredoi]

Description

Just addressing my own comment here #1476 (comment) and going by the gentleman's agreement that we should get as many dependencies off conda-forge as possible

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[codecov]

Codecov Report

Merging #1481 (4a97371) into main (6ae6020) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1481   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files         197      197           
  Lines       10489    10489           
=======================================
  Hits         9425     9425           
  Misses       1064     1064           

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[valeriupredoi]

thanks Manu! I assume Klaus is not unhappy either so am merging 🍺