Remove support for binary elliptic curves

[jschlyter]

Binary elliptic curves are deprecated, see https://cryptography.io/en/latest/changelog/#main

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.43%. Comparing base (e95fb93) to head (0badfd1).
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #194   +/-   ##
=======================================
  Coverage   76.43%   76.43%           
=======================================
  Files          44       44           
  Lines        4550     4550           
  Branches      859      859           
=======================================
  Hits         3478     3478           
  Misses        785      785           
  Partials      287      287           

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