Replace Newtonsoft with System.Text.Json in PackageVersionCheckerService.

[maliming]

The JsonProperty is from Newtonsoft but the JsonSerializer is System.Text.Json

https://support.abp.io/QA/Questions/6909/commercial-nuget-feed-returns-404-errors

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 51.66%. Comparing base (27f84ab) to head (4672bad).
Report is 3 commits behind head on rel-8.1.

Files	Patch %	Lines
...lo/Abp/Cli/Version/PackageVersionCheckerService.cs	0.00%	13 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           rel-8.1   #19382      +/-   ##
===========================================
- Coverage    51.67%   51.66%   -0.01%     
===========================================
  Files         3096     3096              
  Lines        98266    98274       +8     
  Branches      7852     7853       +1     
===========================================
- Hits         50775    50773       -2     
- Misses       45938    45947       +9     
- Partials      1553     1554       +1     

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