Bump System.Data.SqlClient in /examples/MySqlDemo.DbMetadata (#74)

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
...

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examples/MySqlDemo.DbMetadata/MySqlDemo.DbMetadata.csproj

@@ -9,7 +9,7 @@
   <ItemGroup>
     <PackageReference Include="MySqlConnector" Version="0.66.0" />
     <PackageReference Include="NReco.Data" Version="1.1.1" />
-    <PackageReference Include="System.Data.SqlClient" Version="4.8.5" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.6" />
   </ItemGroup>
 
 </Project>