SNOW-1640968 Dispose http response in Okta Authenticator

[sfc-gh-knozderko]

Description

SNOW-1640968 Dispose http response in Okta Authenticator

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

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.62%. Comparing base (adac81a) to head (a283178).

Files	Patch %	Lines
...flake.Data/Core/Authenticator/OktaAuthenticator.cs	80.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1010      +/-   ##
==========================================
- Coverage   85.63%   85.62%   -0.01%     
==========================================
  Files         106      106              
  Lines       10788    10796       +8     
  Branches     1033     1035       +2     
==========================================
+ Hits         9238     9244       +6     
  Misses       1303     1303              
- Partials      247      249       +2     

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