SNOW-1524245 Set initialisation vector length for Gcm encryption to 12 bytes

[sfc-gh-knozderko]

Description

SNOW-1524245 Set initialisation vector length for Gcm encryption to 12 bytes

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.24%. Comparing base (f27eb2a) to head (6a4412c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1056      +/-   ##
==========================================
- Coverage   86.26%   86.24%   -0.02%     
==========================================
  Files         121      121              
  Lines       11779    11779              
  Branches     1196     1196              
==========================================
- Hits        10161    10159       -2     
- Misses       1333     1334       +1     
- Partials      285      286       +1     

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