GOATS-975: Revert tomtoolkit back to stable version to fix migration merge issue.

[davner]

Checklist

• Added a release note in doc/changes using the PR number.

[Copilot]

Pull Request Overview

Reverts the tomtoolkit dependency from version 2.26.2 back to the stable version 2.26.0 to resolve a migration merge issue identified in GOATS-975.

• Downgraded tomtoolkit dependency version to fix migration conflicts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.45%. Comparing base (569b0b9) to head (70207a3).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #458   +/-   ##
=======================================
  Coverage   77.45%   77.45%           
=======================================
  Files         244      244           
  Lines        7834     7834           
  Branches      477      477           
=======================================
  Hits         6068     6068           
  Misses       1677     1677           
  Partials       89       89           

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