Fix pyomo breakage

[irm-codebase]

Fixes #710

Summary of changes in this pull request

• Removed pyomo top limit in hopes to avoid the incompatibility with gurobi 12.0
• Set pyomo lowerbound to 6.8.2 to avoid breakage in older versions
• Fixed a couple of broken pyomo links since 6.8.1 also updated their docs

The pyomo folks were quite quick on fixing this one (Pyomo/pyomo#3414). Let's see what our tests have to say about this fix.

Reviewer checklist

• Test(s) added to cover contribution
• Documentation updated
• Changelog updated
• Coverage maintained or improved

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.98%. Comparing base (ed25596) to head (30a4222).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #713    +/-   ##
========================================
  Coverage   95.97%   95.98%            
========================================
  Files          29       29            
  Lines        4048     4057     +9     
  Branches      849      579   -270     
========================================
+ Hits         3885     3894     +9     
  Misses         72       72            
  Partials       91       91            

see 2 files with indirect coverage changes

---- 🚨 Try these New Features:

• Flaky Tests Detection - Detect and resolve failed and flaky tests

[brynpickering]

Nice to see the CI tests are passing. Can you run them locally with gurobipy installed and pytest -m "needs_gurobi_license"? This will do a more thorough check of the gurobi compatability.

[irm-codebase]

@brynpickering passing without a hitch!

I also ran them with the previous pyomo version I had (6.7.1), and they failed. I've updated the pyomo lowerbound to avoid this problem.