Add System.Text.Json/8.0.3 (#991)

While we already have STJ/8.0.4 in SBRP, we can't use that yet
in msbuild components that target .NET Framework as updated binding redirects
are necessary for that. So meanwhile we need to target a lower version, 8.0.3.

Author: ViktorHofer

eng/Build.props

@@ -35,6 +35,8 @@
     <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\System.Formats.Asn1.6.0.1.csproj" />
     <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\System.Security.Cryptography.Pks.6.0.1.csproj" />
     <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\System.Security.Cryptography.Pks.6.0.4.csproj" />
+
+    <DependencyPackageProjects Include="$(RepoRoot)src\referencePackages\src\**\System.Text.Json.8.0.3.csproj" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(BuildDependencyPackageProjects)' == 'true'">

src/referencePackages/src/system.text.json/8.0.3/System.Text.Json.8.0.3.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFrameworks>net6.0;net7.0;net8.0;netstandard2.0</TargetFrameworks>
+    <AssemblyName>System.Text.Json</AssemblyName>
+    <StrongNameKeyId>Open</StrongNameKeyId>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net6.0'">
+    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net7.0'">
+    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net8.0'">
+    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
+    <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
+    <PackageReference Include="System.Text.Encodings.Web" Version="8.0.0" />
+    <PackageReference Include="System.Buffers" Version="4.5.1" />
+    <PackageReference Include="System.Memory" Version="4.5.5" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
+    <Compile Include="$(CommonSrc)IsExternalInit.cs" />
+  </ItemGroup>
+
+</Project>