Declare ML-DSA as not FIPS approved in the API

[ctz]

Sorry, should have caught this in review. ML-DSA is not included in the latest draft submission (https://github.com/aws/aws-lc/blob/main/crypto/fipsmodule/policydocs/DRAFT-140-3-AmazonSecurityPolicy-3.0.0-dynamic.pdf) so shouldn't return true from fips() here irrespective of the underlying FIPS mode.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.53%. Comparing base (5ea4b9b) to head (fb78408).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aws_lc_rs_algs.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #364   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files          20       20           
  Lines        4094     4094           
=======================================
  Hits         3993     3993           
  Misses        101      101           

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