Add System.Net.Http again to solve CVE warning

[StefH]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 33.91%. Comparing base (5605400) to head (d4ee2dc).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1354      +/-   ##
==========================================
- Coverage   34.33%   33.91%   -0.43%     
==========================================
  Files         150      170      +20     
  Lines       36757    42189    +5432     
==========================================
+ Hits        12622    14309    +1687     
- Misses      23723    27399    +3676     
- Partials      412      481      +69     

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