Update pyomo requirement to 6.7.3

[lbianchi-lbl]

Summary/Motivation:

• Update pyomo requirement to 6.7.3 following today's Pyomo release

Legal Acknowledgement

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1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.79%. Comparing base (1d927a6) to head (5f35d10).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1420      +/-   ##
==========================================
- Coverage   77.79%   77.79%   -0.01%     
==========================================
  Files         393      393              
  Lines       64797    64797              
  Branches    14390    14390              
==========================================
- Hits        50412    50409       -3     
- Misses      11795    11799       +4     
+ Partials     2590     2589       -1     

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[blnicho]

You beat me to it 😄