Update to jsbn 1.4.

[davidlehn]

• Update to jsbn 1.4.
• Retrieved from http://www-cs-students.stanford.edu/~tjw/jsbn/.
• Sync partly back to original style for easier updates every decade or so.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.77419% with 103 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.16%. Comparing base (8e1d527) to head (15776a5).

Files with missing lines	Patch %	Lines
lib/jsbn.js	66.77%	103 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1137   +/-   ##
=======================================
  Coverage   80.15%   80.16%           
=======================================
  Files          42       42           
  Lines        9575     9578    +3     
=======================================
+ Hits         7675     7678    +3     
  Misses       1900     1900           

Files with missing lines	Coverage Δ
lib/jsbn.js	78.30% <66.77%> (-0.19%)	⬇️

... and 2 files with indirect coverage changes

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