Assign new issue to triage action doesn't work

[philnach]

The action for assigning new issues to triage doesn't work and has been failing for a while (201 failures). I've disabled the action and create this issue to capture figuring out why it's failing and to fix it.

Link to a failing action run: https://github.com/microsoft/AdaptiveCards/actions/runs/14178867561

Example log output of action failing:

Link to action: https://github.com/microsoft/AdaptiveCards/actions/workflows/new-issues.yaml