Temporarily lock pyomo to v6.9.5 due to performance regression

[idelder]

see Pyomo/pyomo#3971

Recommend that, until this pyomo issue is resolved or someone finds a way around it (e.g., specifying sort params for all components in Temoa), we lock pyomo to version 6.9.5.

Temporary solution to avoid new Temoa users being put off by models that don't solve.

Summary by CodeRabbit

• Chores
  • Updated the Pyomo package to version 6.9.5 for consistent project environments.
  • Added the required PLY package to installation requirements.
  • Refreshed dependency lock files and package verification hashes.

[coderabbitai]

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ℹ️ Recent review info

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Run ID: eaa1757a-e132-4ed8-8341-95e92ac3d0b6

📥 Commits

Reviewing files that changed from the base of the PR and between 4a8aa60 and 138ce95.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• pyproject.toml
• requirements-dev.txt
• requirements.txt

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Walkthrough

Changes

Dependency pinning

Layer / File(s)	Summary
Update project dependency contract pyproject.toml	Changes the main pyomo dependency from a minimum-version constraint to pyomo==6.9.5.
Synchronize exported requirements requirements.txt, requirements-dev.txt	Pins pyomo to 6.9.5 with updated hashes and adds hashed ply==3.11 entries attributed to pyomo.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• TemoaProject/temoa#353: Updates the pinned pyomo version and hashes in the same requirements files.

Suggested reviewers: particularlypythonicbs, jdecarolis

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: temporarily pinning Pyomo to 6.9.5 because of a performance regression.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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