Update bug bounty process

[edif2008]

Update the Security section of the README to point to the new method of bug bounty reporting for this repo.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.96%. Comparing base (b753141) to head (e589046).
⚠️ Report is 29 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #113   +/-   ##
=======================================
  Coverage   76.96%   76.96%           
=======================================
  Files          27       27           
  Lines        1980     1980           
=======================================
  Hits         1524     1524           
  Misses        456      456           

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