Remove deprecated Error variants

[djc]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.51%. Comparing base (bca63ad) to head (79bf8ea).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/crl/mod.rs	0.00%	3 Missing ⚠️
src/error.rs	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #391      +/-   ##
==========================================
+ Coverage   97.44%   97.51%   +0.07%     
==========================================
  Files          20       20              
  Lines        4104     4099       -5     
==========================================
- Hits         3999     3997       -2     
+ Misses        105      102       -3     

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