How do I get rid of SNI.dll when publishing as a "single file" in Visual Studio 2019?

I’m trying to publish a very simple C# .Net 5.0 WinForms application (single file output) as a test case for porting from the .Net Framework v4.6.1 (what it was previously) while using Visual Studio 2019 v16.8.2. The Publish options are as follows:

• Configuration: Release | Any CPU
• Target Framework: net5.0-windows
• Deployment Mode: Framework-dependent
• Target-Runtime: win-x64
• Produce Single File: Enabled
• Enable ReadyToRun Compilation: Disabled

Although the build works fine and merges the two source assemblies into a single output executable, it also includes SNI.dll in the output directory. The application will not start without this DLL in the same folder as the executable so my question is: How do I remove the dependency on SNI.dll so it does not get included with the published executable and is not required to run?

The application is a simple front-end to generate random data using the Crypto-API. It does not include any database functionality whatsoever, which is why it’s so confusing to me that SNI.dll is included in the output. As far as I can tell, SNI.dll is related to Microsoft.Data.SqlClient, which I don’t use

Any help with this would be most appreciated. Cheers

PS. I should mention, all my attempts to Google this fault have turned up articles about "SNI.dll Missing", "SNI.dll failed to load" or some other variant of that