chore(deps): use stdlib ed25519 instead of x

[MDr164]

Allows us to drop another 3rdparty dependency as the needed functionality has since moved to stdlib.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.51%. Comparing base (a3bb0f9) to head (16a23be).
Report is 21 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #620   +/-   ##
=======================================
  Coverage   70.51%   70.51%           
=======================================
  Files          10       10           
  Lines        2123     2123           
=======================================
  Hits         1497     1497           
  Misses        505      505           
  Partials      121      121           

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