Changing MOPAC channel

[calvinp0]

RMG team has removed mopac from the rmg channel, thus we need to change the channel of our mopac installation from rmg to conda-forge

[codecov[bot]]

Codecov Report

Merging #662 (ff1ed0d) into main (af85c33) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #662   +/-   ##
=======================================
  Coverage   73.19%   73.20%           
=======================================
  Files          99       99           
  Lines       26304    26304           
  Branches     5502     5502           
=======================================
+ Hits        19253    19255    +2     
+ Misses       5688     5687    -1     
+ Partials     1363     1362    -1     

Flag	Coverage Δ
unittests	73.20% <ø> (+<0.01%)	:arrow_up:

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see 1 file with indirect coverage changes

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