[CG] Upgrade System.Text.Json (#10185)

Author: advay26

src/NuGet.Protocol.Catalog/NuGet.Protocol.Catalog.csproj

@@ -11,6 +11,7 @@
     <PackageReference Include="Newtonsoft.Json" />
     <PackageReference Include="NuGet.Protocol" />
     <PackageReference Include="System.Formats.Asn1" />
+    <PackageReference Include="System.Text.Json" />
   </ItemGroup>
 
 </Project>

src/NuGetGallery.Services/NuGetGallery.Services.csproj

@@ -57,6 +57,7 @@
     <PackageReference Include="NuGet.Protocol" />
     <PackageReference Include="NuGet.StrongName.WebBackgrounder" />
     <PackageReference Include="System.Runtime" />
+    <PackageReference Include="System.Text.Json" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net472'">

tests/Validation.PackageSigning.Core.Tests/Validation.PackageSigning.Core.Tests.csproj

@@ -13,6 +13,7 @@
     <PackageReference Include="NuGet.Commands" />
     <PackageReference Include="NuGet.PackageManagement" />
     <PackageReference Include="NuGet.Resolver" />
+    <PackageReference Include="System.Text.Json" />
     <PackageReference Include="xunit.runner.visualstudio">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>