Update the Pyomo tag to the 6.7.0 release

[blnicho]

Summary/Motivation:

Update Pyomo requirement to 6.7.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (214f32a) 77.41% compared to head (90aaebe) 77.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1292      +/-   ##
==========================================
- Coverage   77.41%   77.34%   -0.07%     
==========================================
  Files         390      390              
  Lines       63404    63404              
  Branches    11658    11658              
==========================================
- Hits        49082    49040      -42     
- Misses      11793    11835      +42     
  Partials     2529     2529              

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