chore: bump sopt to 1.2.1 and scalatest to 3.2.20

[tfenne]

Updating sopt to 1.2.1 lets us move scalatest to 3.2.20. scalatest 3.2.x's HTML reporter requires flexmark-all on the test classpath, so add it explicitly (sopt declares it test-scoped, so it doesn't transit).

[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: a865e189-80dd-4c84-9d09-50d9c950f9ba

📥 Commits

Reviewing files that changed from the base of the PR and between 21470e2 and caeeb3d.

📒 Files selected for processing (1)

• build.sbt

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📝 Walkthrough

Walkthrough

This PR updates build dependencies in the root project. The sopt library is bumped to 1.2.1, while test dependencies are refreshed: scalatest moves to 3.2.20 and flexmark-all 0.64.8 is added for test scope. No functional code changes—purely dependency maintenance.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and accurately summarizes the main changes: bumping sopt to 1.2.1 and scalatest to 3.2.20, which matches the changeset exactly.
Description check	✅ Passed	The description directly explains the changeset, detailing why sopt was bumped, why scalatest was upgraded, and why flexmark-all was added as a test dependency.
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch update-sopt-1.2.1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.94%. Comparing base (21470e2) to head (caeeb3d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1161   +/-   ##
=======================================
  Coverage   95.94%   95.94%           
=======================================
  Files         132      132           
  Lines        8331     8331           
  Branches      940      940           
=======================================
  Hits         7993     7993           
  Misses        338      338           

Flag	Coverage Δ
unittests	95.94% <ø> (ø)

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[github-actions]

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