Bump System.Data.SqlClient in /samples/tutorials/c#/SLES/SqlServerSample

Bumps [System.Data.SqlClient](https://github.com/dotnet/corefx) from 4.4.0 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
...

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Author: dependabot[bot]

samples/tutorials/c#/SLES/SqlServerSample/SqlServerSample.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Data.SqlClient" Version="4.4.0" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.6" />
   </ItemGroup>
 
 </Project>