Upgrade project(s) to the SDK-style project format

[github-actions]

There are 2 project(s) using the non-SDK-style project format. This is an auto-generated issue, detailed and discussed in dotnet/docs#22271.

• non-lts/project.json
• non-lts/ReallyOld.xproj

Consider upgrading the project(s) to the SDK-style format.

If any of these projects listed in this issue are intentionally demonstrating the old project style, you can optionally configure to ignore these results in future automation executions. Create a (or update the) dotnet-versionsweeper.json file at the root of the repository and add an ignore entry following the globbing patterns detailed here.

{
    "ignore": [
        "**/path/to/example.csproj"
    ]
}