Remove dependency on System.Text.Json

[christianhelle]

This pull request includes a small change to the src/Refitter.Core/Refitter.Core.csproj file. The change removes the System.Text.Json package reference.

• src/Refitter.Core/Refitter.Core.csproj: Removed the System.Text.Json package reference.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.95%. Comparing base (f44d839) to head (de9267c).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
+ Coverage   95.02%   98.95%   +3.92%     
==========================================
  Files          54       54              
  Lines        2676     2582      -94     
==========================================
+ Hits         2543     2555      +12     
+ Misses         99        4      -95     
+ Partials       34       23      -11     

Flag	Coverage Δ
unittests	98.95% <ø> (+3.92%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.