[Infra] Fix W3cTraceContext tests for net8.0

Attempt to resolve `System.IO.FileNotFoundException : Could not load file or assembly 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.` caused by reference to OpenTelemetry.Instrumentation.AspNetCore 1.12.0.

Author: martincostello

test/OpenTelemetry.Instrumentation.W3cTraceContext.Tests/OpenTelemetry.Instrumentation.W3cTraceContext.Tests.csproj

@@ -6,6 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" VersionOverride="9.0.9" />
     <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" />
   </ItemGroup>