Bump System.Data.SqlClient from 4.8.5 to 4.8.6 in /src/Opserver.Core

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>

src/Opserver.Core/Opserver.Core.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="StackExchange.Exceptional.Shared" Version="2.2.32" />
     <PackageReference Include="StackExchange.Redis" Version="2.6.122" />
     <PackageReference Include="StackExchange.Utils.Http" Version="0.3.48" />
-    <PackageReference Include="System.Data.SqlClient" Version="4.8.5" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.8.6" />
     <PackageReference Include="System.DirectoryServices" Version="6.0.0" />
     <PackageReference Include="System.Management" Version="6.0.0" />
     <PackageReference Include="System.Runtime.Caching" Version="6.0.0" />