Remove arbitrary HKDF info length limit

[justsmth]

Description of changes:

• Remove arbitrary HKDF limit on the number of info bytes.

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.

[cpu]

Thank you for the super quick turnaround! The patch looks great to me. I also switched my downstream branch to use this and was able to run through the problematic HPKE test vectors without error 👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.67%. Comparing base (c358484) to head (fed7282).
Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
- Coverage   95.80%   92.67%   -3.13%     
==========================================
  Files          61       61              
  Lines        8143     8174      +31     
  Branches        0     8174    +8174     
==========================================
- Hits         7801     7575     -226     
- Misses        342      357      +15     
- Partials        0      242     +242     

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