Update conda install commands after idaes-pse was added to conda-forge

[lbianchi-lbl]

Resolves #1538

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.04%. Comparing base (5841433) to head (7423095).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1543      +/-   ##
==========================================
- Coverage   77.05%   77.04%   -0.01%     
==========================================
  Files         384      384              
  Lines       62338    62338              
  Branches    10222    10222              
==========================================
- Hits        48034    48031       -3     
- Misses      11875    11879       +4     
+ Partials     2429     2428       -1     

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