Temporarily exclude sphinx 8.2.0 to fix doctests

[blnicho]

Summary/Motivation:

Doctests started failing with the latest Sphinx release. We noticed similar issues in Pyomo that could be traced to Sphinx extensions that don't yet support Sphinx 8.2.0. This PR excludes this version of Sphinx for now to get IDAES tests passing again. I haven't identified which Sphinx extension is the underlying cause of the issue.

Changes proposed in this PR:

• Exclude Sphinx version 8.2.0

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.
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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.86%. Comparing base (2182772) to head (4dd256e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1572      +/-   ##
==========================================
- Coverage   76.86%   76.86%   -0.01%     
==========================================
  Files         394      394              
  Lines       63233    63233              
  Branches    10355    10355              
==========================================
- Hits        48604    48601       -3     
- Misses      12184    12188       +4     
+ Partials     2445     2444       -1     

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[ksbeattie]

LGTM