fix: compile error on Unity 2021.2 or earlier

[mob-sakai]

Changes

• Enum.TryParse(Type, string, bool, out Enum) method requires .netstandard 2.1
• The SetDebugSymbols method is only used within the #if UNITY_6000_0_OR_NEWER - #elif section.

Related Issues

• Build fails on Unity 2021.2 or earlier #752

Related PRs

Successful Workflow Run Link

PRs don't have access to secrets so you will need to provide a link to a successful run of the workflows from your own
repo.

• Builds - Windows: https://github.com/mob-sakai/unity-builder/actions/runs/18431406693
• Builds - Ubuntu: https://github.com/mob-sakai/unity-builder/actions/runs/18431406705
• Builds - MacOS: https://github.com/mob-sakai/unity-builder/actions/runs/18431406700

Checklist

• Read the contribution guide and accept the
  code of conduct
• Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR
  in the documentation repo)
• Readme (updated or not needed)
• Tests (added, updated or not needed)

[github-actions]

[coderabbitai]

Important

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✨ Finishing touches

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• Create PR with unit tests
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.34%. Comparing base (d587557) to head (a6b9c3b).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #753   +/-   ##
=======================================
  Coverage   38.34%   38.34%           
=======================================
  Files          78       78           
  Lines        3169     3169           
  Branches      663      663           
=======================================
  Hits         1215     1215           
  Misses       1809     1809           
  Partials      145      145           

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