version.schema.json is UTF-8 with BOM, VSCode expects no BOM

[amis92]

Description

Visual Studio Code complains that the version.schema.json file contains a BOM, when referencing https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/main/src/NerdBank.GitVersioning/version.schema.json as $schema.

Impact

Currently, just a warning squiggle is shown, but the schema is correctly resolved and intellisense works.
I do not know whether this will work in future, but for now it's just irritating to see warnings when everything is actually fine.

Suggested Solution

Remove BOM from the version.schema.json. It shouldn't negatively impact any tooling.

[AArnott]

Thanks for investigating and fixing this. I have seen the warning squiggle in VS Code many times but never hovered over it to discover what exactly it was complaining about.
I don't object to the fix, but I think it's super lame that VS Code complains about this (even though it is actually supported), so I'll file a bug against VS Code too.

[AArnott]

Filed microsoft/vscode#163683.