Remove Requires.jl dependency

[wouterwln]

Removed the requirement for Zygote extension for backward compatibility.

fix #547

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.28%. Comparing base (e6be62e) to head (76367f0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #564      +/-   ##
==========================================
- Coverage   80.28%   80.28%   -0.01%     
==========================================
  Files         211      211              
  Lines        6265     6264       -1     
==========================================
- Hits         5030     5029       -1     
  Misses       1235     1235              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

🤖 Code Formatting

Your PR still has some code formatting issues. I've updated PR #568 with the necessary formatting changes.

You can merge that PR into this branch to fix the code style check.

Alternatively, you can run make format locally and push the changes yourself.