0.103.5: support P256+SHA512 and P384+SHA512

[ctz]

Proposed release notes:

• New feature: support verification of P256+SHA512 and P384-SHA512 ECDSA signatures with aws-lc-rs. This is not a recommended combination, but such signatures exist in the wild.

In pursuit of rustls/rustls#2477

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.45%. Comparing base (ac0500d) to head (31e1714).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #379   +/-   ##
=======================================
  Coverage   97.45%   97.45%           
=======================================
  Files          20       20           
  Lines        4088     4088           
=======================================
  Hits         3984     3984           
  Misses        104      104           

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