Add computation of previous and next certificate versions based on ID.

[J08nY]

Fixes #457.

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 18 lines in your changes missing coverage. Please review.

Project coverage is 67.74%. Comparing base (52e5851) to head (d2a5644).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/sec_certs/sample/cc.py	48.58%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
- Coverage   68.54%   67.74%   -0.79%     
==========================================
  Files          62       62              
  Lines        7900     7934      +34     
==========================================
- Hits         5414     5374      -40     
- Misses       2486     2560      +74     

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