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

[github-actions]

There are 3 project(s) using the non-SDK-style project format.
This is an auto-generated issue, detailed and discussed in dotnet/docs#22271.

• wpf/Threading/MultithreadedWindow/net48/vb/ProjectVB.vbproj
• wpf/Threading/PrimeNumber/net48/vb/PrimeNumber.vbproj
• wpf/Threading/Weather/net48/vb/ProjectVB.vbproj

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"
    ]
}