Bump FSharp.SystemTextJson from 0.17.4 to 0.19.13 (#41)

Bumps [FSharp.SystemTextJson](https://github.com/tarmil/FSharp.SystemTextJson) from 0.17.4 to 0.19.13.
- [Release notes](https://github.com/tarmil/FSharp.SystemTextJson/releases)
- [Changelog](https://github.com/Tarmil/FSharp.SystemTextJson/blob/master/CHANGELOG.md)
- [Commits](https://github.com/tarmil/FSharp.SystemTextJson/compare/v0.17.4...v0.19.13)

---
updated-dependencies:
- dependency-name: FSharp.SystemTextJson
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Live.Avalonia.FuncUI.Sample/Live.Avalonia.FuncUI.Sample.fsproj

@@ -18,7 +18,7 @@
 
     <ItemGroup>
         <PackageReference Include="Avalonia.Desktop" Version="$(AvaloniaVersion)" />
-        <PackageReference Include="FSharp.SystemTextJson" Version="0.17.4" />
+        <PackageReference Include="FSharp.SystemTextJson" Version="0.19.13" />
         <PackageReference Include="JaggerJo.Avalonia.FuncUI" Version="$(FuncUIVersion)" />
         <PackageReference Include="JaggerJo.Avalonia.FuncUI.DSL" Version="$(FuncUIVersion)" />
         <PackageReference Include="JaggerJo.Avalonia.FuncUI.Elmish" Version="$(FuncUIVersion)" />