fix: Make STJ Conditional (#435)

Signed-off-by: James Thompson <[email protected]>

Author: thompson-tomo

src/OpenFeature.Providers.Ofrep/OpenFeature.Providers.Ofrep.csproj

@@ -20,7 +20,6 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.Logging" Version="8.0.0"/>
-    <PackageReference Include="System.Text.Json" Version="8.0.5"/>
     <PackageReference Include="OpenFeature" Version="$(OpenFeatureVersion)"/>
   </ItemGroup>
   <PropertyGroup>
@@ -31,6 +30,7 @@
     Condition=" '$(TargetFramework)' == 'net462' or '$(TargetFramework)' == 'netstandard2.0'">
     <PackageReference Include="System.Net.Http" Version="4.3.4"/>
     <PackageReference Include="System.Net.Http.Json" Version="8.0.1"/>
+    <PackageReference Include="System.Text.Json" Version="8.0.5"/>
   </ItemGroup>
 
   <!-- documentation -->