THRIFT-5684 upgrade to net7.0:
Client: netstd
Patch: Jens Geyer
diff --git a/test/netstd/Client/Client.csproj b/test/netstd/Client/Client.csproj
index 69e1301..bd7d1ee 100644
--- a/test/netstd/Client/Client.csproj
+++ b/test/netstd/Client/Client.csproj
@@ -19,7 +19,7 @@
   -->
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <LangVersion>9.0</LangVersion>
     <AssemblyName>Client</AssemblyName>
     <PackageId>Client</PackageId>
@@ -35,9 +35,9 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="6.0.0" />
+    <PackageReference Include="System.Net.Http.WinHttpHandler" Version="7.0.0" />
     <PackageReference Include="System.Runtime.Serialization.Primitives" Version="[4.3,)" />
-    <PackageReference Include="System.ServiceModel.Primitives" Version="4.9.0" />
+    <PackageReference Include="System.ServiceModel.Primitives" Version="4.10.0" />
     <PackageReference Include="System.Threading" Version="[4.3,)" />
   </ItemGroup>