Unable to update Visual Studio SDK project

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Package ecosystem

nuget

### Package manager version

6.12

### Language version

C# 13

### Manifest location and content before the Dependabot update

https://github.com/na1307/Civ6ModBuddyAlt/blob/d77cf87b7127abe137e2a86c3f1d5dc463125f3d/Directory.Packages.props

### dependabot.yml content

https://github.com/na1307/Civ6ModBuddyAlt/blob/d77cf87b7127abe137e2a86c3f1d5dc463125f3d/.github/dependabot.yml

### Updated dependency

Nothing

### What you expected to see, versus what you actually saw

dependabot fails with the following error for VSSDK projects:

```
/home/dependabot/dependabot-updater/repo/Civ6ModBuddyAlt/Civ6ModBuddyAlt.csproj(212,3): error MSB4019: The imported project "/home/dependabot/.nuget/packages/microsoft.vssdk.buildtools/17.10.2179/tools/VSSDK/Microsoft.VsSDK.targets" was not found. Confirm that the expression in the Import declaration "/home/dependabot/.nuget/packages/microsoft.vssdk.buildtools/17.10.2179/build/../tools/VSSDK/Microsoft.VsSDK.targets" is correct, and that the file exists on disk.
```

### Native package manager behavior

_No response_

### Images of the diff or a link to the PR, issue, or logs

https://github.com/na1307/Civ6ModBuddyAlt/actions/runs/13205857605/job/36868714226

### Smallest manifest that reproduces the issue

_No response_

Start with the linked Directory.Packages.props, .github/dependabot.yml, and the failed Actions job to reproduce the MSB4019 error for the VSSDK project. Done means Dependabot can process the project without failing because Microsoft.VsSDK.targets is missing.

Written by the indexing model from the issue text.