Add Tls13

[StefH]

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[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 35.71%. Comparing base (45d4e70) to head (c3b8d55).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/WireMock.Net.Minimal/Http/HttpClientBuilder.cs	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1363      +/-   ##
==========================================
+ Coverage   34.68%   35.71%   +1.02%     
==========================================
  Files         152      152              
  Lines       36815    34539    -2276     
==========================================
- Hits        12771    12337     -434     
+ Misses      23621    21777    -1844     
- Partials      423      425       +2     

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