Correct types finished-based APIs for TLS 1.3

[samuel40791765]

Properly return false instead of ssl_hs_error in tls13_*_finished

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.19%. Comparing base (8fbad8c) to head (6d91a82).

Files with missing lines	Patch %	Lines
ssl/tls13_both.cc	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3087      +/-   ##
==========================================
+ Coverage   78.16%   78.19%   +0.03%     
==========================================
  Files         689      689              
  Lines      121821   121821              
  Branches    16995    16995              
==========================================
+ Hits        95216    95254      +38     
+ Misses      25720    25683      -37     
+ Partials      885      884       -1     

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