Improve FIPS and no-deprecated testing

[tofay]

• use ctor to ensure FIPS provider is always loaded for FIPS tests.
• run tests against OpenSSL compiled with no-deprecated to guard against legacy crypto usage

[codecov]

Codecov Report

❌ Patch coverage is 77.58621% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.49%. Comparing base (5d4a050) to head (23c074b).

Files with missing lines	Patch %	Lines
src/openssl_internal/mod.rs	0.00%	8 Missing ⚠️
src/kx_group/ec.rs	80.00%	6 Missing ⚠️
src/lib.rs	0.00%	6 Missing ⚠️
src/test_support.rs	92.85%	3 Missing ⚠️
src/verify.rs	86.66%	2 Missing ⚠️
src/openssl_internal/kem.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
+ Coverage   81.39%   81.49%   +0.09%     
==========================================
  Files          20       21       +1     
  Lines        1892     1967      +75     
==========================================
+ Hits         1540     1603      +63     
- Misses        352      364      +12     

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