winget upgrade Microsoft.WSL fails with error 0x80073d28 instead of triggering UAC prompt

Nobody has claimed this yet.

### Windows Version

10.0.26100.8875

### WSL Version

2.7.11.0 upgrading to 2.7.13

### Are you using WSL 1 or WSL 2?

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

6.18.33.2-2

### Distro Version

N/A (Package upgrade issue via WinGet)

### Other Software

Windows Package Manager (winget)

### Repro Steps

1. Open a standard (non-elevated/unprivileged) PowerShell terminal.
2. Run winget upgrade Microsoft.WSL.
3. Observe the installer start progress.

### Expected Behavior

winget prompts a User Account Control (UAC) elevation request to allow administrator privileges for the installation to proceed, matching previous versions and standard system app upgrade behavior.

### Actual Behavior

The installer fails immediately at 1% progress without triggering a UAC prompt, outputting the following error:
`Installer failed with exit code: 0x80073d28 : The package installation failed because administrator privileges are required. Please contact an administrator to install this package.`

### Diagnostic Logs

UAC is set to Always Notify

Reproduce the failure from a standard, non-elevated PowerShell terminal with `winget upgrade Microsoft.WSL`, using the reported WSL versions and UAC setting. Compare the observed 0x80073d28 failure with the expected UAC prompt; done means the upgrade requests elevation and proceeds successfully.

Written by the indexing model from the issue text.