Temporarily require IDAES 2.0/Pyomo 6.5 until IDAES 2.1/Pyomo 6.6 failures are resolved

[lbianchi-lbl]

Summary/Motivation

Complementary to #199 to try to see if we can narrow down the causes for the CI failures we're seeing after IDAES 2.1/Pyomo 6.6

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the license terms described in the LICENSE.md and COPYRIGHT.md 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]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e1ef58b) 89.49% compared to head (021b049) 89.49%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #203   +/-   ##
=======================================
  Coverage   89.49%   89.49%           
=======================================
  Files          67       67           
  Lines        8238     8238           
=======================================
  Hits         7373     7373           
  Misses        865      865           

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[nareshsusarla]

looks good