Update FIPS v3.0 draft security policy

[justsmth]

Issues:

Addresses CryptoAlg-2802

Description of changes:

Update for FIPS v3.0 (dynamic) security policy

Testing

Can be viewed on this branch: https://github.com/justsmth/aws-lc/blob/fips-v3.0-secpol-update/crypto/fipsmodule/FIPS.md

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.76%. Comparing base (6c58a0f) to head (144be29).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2047   +/-   ##
=======================================
  Coverage   78.76%   78.76%           
=======================================
  Files         598      598           
  Lines      103668   103667    -1     
  Branches    14739    14738    -1     
=======================================
+ Hits        81654    81656    +2     
+ Misses      21360    21359    -1     
+ Partials      654      652    -2     

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