[Dependencies] Bump System.ClientModel (#803)

The focus of these changes is to adopt the latest stable release of System.ClientModel.

Author: jsquire

src/OpenAI.csproj

@@ -74,11 +74,11 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
-    <PackageReference Include="System.ClientModel" Version="1.7.0" />
+    <PackageReference Include="System.ClientModel" Version="1.8.0" />
     <PackageReference Include="System.Net.ServerSentEvents" Version="9.0.9" />
   </ItemGroup>
 
   <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net6.0'))">
     <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="8.0.1" />
   </ItemGroup>
-</Project>
+</Project>