Bump System.Data.SqlClient in /tracer/test/Datadog.Trace.Tests

Bumps [System.Data.SqlClient](https://github.com/dotnet/corefx) from 4.8.5 to 4.8.6.
- [Release notes](https://github.com/dotnet/corefx/releases)
- [Commits](https://github.com/dotnet/corefx/commits)

---
updated-dependencies:
- dependency-name: System.Data.SqlClient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

tracer/test/Datadog.Trace.Tests/Datadog.Trace.Tests.csproj

@@ -21,7 +21,7 @@
     <PackageReference Include="Serilog" Version="2.5.0" />
     <PackageReference Include="Serilog.Sinks.Observable" Version="2.0.1" />
     <PackageReference Include="System.Reactive.Core" Version="3.1.1" />
-    <PackageReference Include="System.Data.SqlClient" Version="4.8.5" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.6" />
     <PackageReference Include="System.Data.SQLite.Core" Version="1.0.113.7" />
 
     <ProjectReference Include="..\..\src\Datadog.Trace\Datadog.Trace.csproj" />
@@ -40,7 +40,7 @@
 
   <ItemGroup Condition=" $(TargetFramework.StartsWith('net4')) ">
     <Reference Include="System.Net.Http" />
-    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.6.0" />
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="4.7.0" />
   </ItemGroup>
 
   <ItemGroup Condition=" !$(TargetFramework.StartsWith('net4')) ">