Updating nuget package sources

[ladeak]

• Using nuget version of System.Text.Json
• Updating Swashbuckle

[codecov-commenter]

Codecov Report

Merging #40 (803830a) into master (2202106) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #40   +/-   ##
=======================================
  Coverage   99.07%   99.07%           
=======================================
  Files          18       18           
  Lines         541      541           
=======================================
  Hits          536      536           
  Misses          5        5           

Flag	Coverage Δ
dotnet	99.07% <ø> (ø)

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Impacted Files	Coverage Δ
...MergePatch.AspNetCore/JsonMergePatchInputReader.cs	97.72% <ø> (ø)

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