OfficeTimeline.OfficeTimeline - validation installation error

### Please confirm these before moving forward

- [x] I have searched for my issue and not found a work-in-progress/duplicate/resolved issue.
- [x] I have not been informed if the issue is resolved in a preview version of the winget client.

### Category of the issue

Installation issue.

### Brief description of your issue

@stephengillie Hi Stephen, this app seems to have a perpetual error that is invalidating every PR since version 12.5.0
Are you able to have a look at a fix please?
Any help would be really appreciated.
Thankyou!
Mitch

### Steps to reproduce

n/a

### Actual behavior

app is not passing validation

### Expected behavior

app to be installed correctly

### Environment

```raw
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### Screenshots and Logs

_No response_

No file, test, or entry point is named, and the issue provides no reproduction steps or logs. Start by locating the OfficeTimeline version 12.5.0 package and reproducing its validation failure; done means the package passes validation and the app installs correctly.

Written by the indexing model from the issue text.