update FluentAssertions to 6.12.0

[SureshRepos]

• I have performed a self-review of my code
• My code follows the style guidelines of this project
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Comments in areas I changed are up to date
• I have added comments to hard-to-understand areas of my code
• I have made corresponding changes to the README.md

[siriak]

Please check why build fails. You also need to make corresponding changes to application code.

[SureshRepos]

All tests passed successfully!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cd7d7fb) 94.91% compared to head (fb24275) 94.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #446      +/-   ##
==========================================
+ Coverage   94.91%   94.94%   +0.03%     
==========================================
  Files         234      234              
  Lines        9843     9843              
  Branches     1382     1382              
==========================================
+ Hits         9342     9345       +3     
+ Misses        386      384       -2     
+ Partials      115      114       -1     

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[siriak]

Good. You need to remove commented out code as Codacy suggests

[siriak]

Looks good, thanks!