Add test to ensure sequence numbers are allowed to increase by more than one

[maddeleine]

Issues:

P131226031

Description of changes:

EVP_aead_aes_128_gcm_tls13() and EVP_aead_aes_256_gcm_tls13() are currently required to encrypt with a monotonically-increasing sequence number. This sequence number however is allowed to increase by more than 1 per encrypt call. This PR adds a test to codify this behavior.

Call-outs:

Testing:

Adds test.
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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.22%. Comparing base (90315e2) to head (88cb7dc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1667      +/-   ##
==========================================
- Coverage   78.22%   78.22%   -0.01%     
==========================================
  Files         571      571              
  Lines       95519    95533      +14     
  Branches    13699    13700       +1     
==========================================
+ Hits        74719    74729      +10     
- Misses      20188    20194       +6     
+ Partials      612      610       -2     

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