Implement StdError for sct::Error

[djc]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.72%. Comparing base (412547d) to head (fd0bba6).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sct.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #446      +/-   ##
==========================================
- Coverage   96.84%   96.72%   -0.13%     
==========================================
  Files          20       20              
  Lines        3898     3903       +5     
==========================================
  Hits         3775     3775              
- Misses        123      128       +5     

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